{"id":1304,"date":"2018-02-05T23:55:50","date_gmt":"2018-02-05T15:55:50","guid":{"rendered":"http:\/\/blog.xiunian.wang\/?p=1304"},"modified":"2024-10-05T17:06:15","modified_gmt":"2024-10-05T09:06:15","slug":"volatile-%e6%98%af%e4%b8%aa%e5%98%9b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/blog.xiunian.wang\/?p=1304","title":{"rendered":"volatile \u662f\u4e2a\u561b\uff1f"},"content":{"rendered":"<p>Q\uff1a\u4f60\u5b66\u7684\u662fjava\uff1f<br \/>\nA\uff1a\u662f\u7684\u3002\u5927\u5b66\u5b66\u8fc7\u3002<br \/>\nQ: \u90a3\u4f60\u8bf4\u8bf4java\u7684\u5173\u952e\u5b57volatile<br \/>\nA: (\u5fc3\u60f3\uff1a\u53cc\u91cd\u9501\uff0c\u5355\u4f8b\u6a21\u5f0f\uff0cvolatile\u3002\u3002\u3002)volatile\u662f\u7528\u6765\u9632\u6b62\u6307\u4ee4\u91cd\u6392\u548c\u4fdd\u8bc1\u5185\u5b58\u53ef\u89c1\u3002<br \/>\nQ: \u5b83\u7684\u539f\u7406\u5462\uff1f<br \/>\nA\uff1a(TMD\u539f\u7406\uff0c\u80af\u5b9a\u5c31\u662f\u548c\u865a\u62df\u673a\u6709\u5173\u5566NND\uff09\u53ea\u77e5\u9053\u7528\uff0c\u6ca1\u6709\u7814\u7a76\u8fc7\u8fd9\u4e2a\u3002<br \/>\nQ\uff1a\u597d\u5427\uff0c\u4f60\u8fd8\u6709\u4ec0\u4e48\u8981\u95ee\u7684\u561b\uff1f<br \/>\nA\uff1a\u4f60\u4eec\u8fd9\u4e2a\u5c97\u4f4d\u671f\u5f85\u62db\u8058\u4ec0\u4e48\u6837\u7684\u4eba\uff1f<br \/>\nQ\uff1a\u55ef\uff0c\u9ad8\u7ea7\u4e00\u70b9\u7684\u5427\u3002<br \/>\nA\uff1a\u54e6\u3002\u6ca1\u6709\u4e86\u3002<br \/>\nQ\uff1a\u90a3 \u56de\u53bb\u7b49\u6d88\u606f\u5427\u3002<\/p>\n<p>\u8fd8\u539f\u4e00\u4e0b\u6700\u8fd1\u7684\u4e00\u756a\u5bf9\u8bdd\uff0c\u4e0d\u8fc7\u6211\u5b9e\u5728\u662f\u6ca1\u8bb0\u5f97\u5f53\u521djava\u8bfe\u4e0a\u6709\u8bb2\u8fc7\u8fd9\u4e2a\uff0c\u77e5\u9053\u6307\u4ee4\u91cd\u6392\u548c\u5185\u5b58\u53ef\u89c1\u8fd8\u662f\u4ece\u67d0\u7bc7\u535a\u5ba2\u4e0a\u770b\u5230\u7684\uff0c\u4e5f\u6ca1\u6709\u60f3\u8fc7\u539f\u7406\u548c\u4e3a\u4ec0\u4e48\u8981\u8fd9\u4e48\u505a\u3002\u90a3\u4eca\u5929\u62bd\u7a7a\u7406\u4e00\u7406\u8fd9\u4e2a\u3002\u73b0\u5728\u60f3\u60f3\u5e94\u8be5\u662f\u60f3\u901a\u8fc7\u5176\u4e86\u89e3jvm\u76f8\u5173\u7684\u4e1c\u897f\u5427\u3002<br \/>\n<!--more--><\/p>\n<p>\u9996\u5148\u5728\u591a\u6838\u5904\u7406\u5668\u7cfb\u7edf\u4e2d\uff0c\u5bf9\u4e00\u4e2a\u53d8\u91cf\u7684\u4fee\u6539\u662f\u5b58\u50a8\u5728CPU\u7f13\u5b58\u4e2d\u7684\u3002<br \/>\n\u5982\u679c\u5c06\u4e00\u4e2a\u57df\u58f0\u660e\u4e3avolatile\u7684\uff0c\u90a3\u4e48\u53ea\u8981\u5bf9\u8fd9\u4e2a\u57df\u4ea7\u751f\u4e86\u5199\u64cd\u4f5c\uff0c\u90a3\u4e48\u6240\u6709\u7684\u8bfb\u64cd\u4f5c\u90fd\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u4fee\u6539\uff0c\u5373\u4f7f\u4f7f\u7528\u4e86cpu\u7f13\u5b58\uff0c\u8be5\u57df\u4f1a\u88ab\u7acb\u5373\u5199\u5165\u5230\u4e3b\u5b58\u3002\u800c\u8bfb\u53d6\u64cd\u4f5c\u5c31\u53d1\u751f\u5728\u4e3b\u5b58\u3002\u8fd9\u4e00\u8fc7\u7a0b\u4ea7\u751f\u7684\u7ed3\u679c\u7684\u7684\u5173\u7cfb\u53eb <a href=\"https:\/\/en.wikipedia.org\/wiki\/Happened-before\" target=\"_blank\" rel=\"noopener\">Happened-Before<\/a><\/p>\n<h3>jvm \u591a\u7ebf\u7a0b\u4e0b\u7684\u5185\u5b58\u6a21\u578b<\/h3>\n<pre>\u7ebf\u7a0bA \u5de5\u4f5c\u5185\u5b58\n            |----- \u5185\u5b58\u8bfb\u5199\u64cd\u4f5c ---\u4e3b\u5185\u5b58\n\u7ebf\u7a0bB \u5de5\u4f5c\u5185\u5b58 \n<\/pre>\n<p>\u7528\u56fe\u6765\u8868\u793a\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1313\" src=\"\/wp-content\/uploads\/2018\/02\/java-memory-model-2.png\" alt=\"\" width=\"486\" height=\"435\" srcset=\"https:\/\/blog.xiunian.wang\/wp-content\/uploads\/2018\/02\/java-memory-model-2.png 486w, https:\/\/blog.xiunian.wang\/wp-content\/uploads\/2018\/02\/java-memory-model-2-300x269.png 300w\" sizes=\"(max-width: 486px) 100vw, 486px\" \/><\/p>\n<p>feature\uff1a \u4e3b\u5185\u5b58\u88ab\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\uff0c \u5b58\u50a8\u7684\u662f heap \u548c \u9759\u6001\u53d8\u91cf\u7684 \u201c\u672c\u5c0a\u201d<\/p>\n<p>\u5de5\u4f5c\u5185\u5b58\uff1a \u6bcf\u4e00\u4e2a\u7ebf\u7a0b\u90fd\u62e5\u6709\u81ea\u5df1\u7684\u5de5\u4f5c\u5185\u5b58\uff0c\u5b58\u50a8\u4e86\u4e3b\u5b58\u4e2d\u7684\u526f\u672c \uff0c\u53ef\u4ee5\u7406\u89e3\u4e3aCPU\u9ad8\u901f\u7f13\u5b58\u3002 \u7ebf\u7a0b\u64cd\u4f5c\u7684\u662f\u5de5\u4f5c\u5185\u5b58\u4e2d\u7684\u526f\u672c\uff0c\u7ebf\u7a0b\u4e4b\u95f4\u4e0d\u80fd\u76f4\u63a5\u64cd\u4f5c\u522b\u4eba\u7684\u5de5\u4f5c\u5185\u5b58\uff0c\u901a\u8fc7\u4e3b\u5b58\u8fdb\u884c\u3002<\/p>\n<p>\u8fd9\u6837\u95ee\u9898\u5c31\u6765\u4e86\uff0c\u5982\u679c\u6ca1\u6709\u540c\u6b65\u9501\uff0c\u90a3\u4e48\u7ebf\u7a0bA \u64cd\u4f5c\u5b8c\u8fd8\u6ca1\u6709\u5199\u5165\u4e3b\u5b58\u4e2d\uff0c\u90a3\u4e48\u7ebf\u7a0bB\u5373\u4f7f\u540e\u9762\u8fd0\u884c\uff0c\u518d\u53bb\u8bfb\u53d6\u6570\u636e\uff0c\u4f46\u662f\u83b7\u53d6\u5230\u7684\u662f\u65e7\u7684\u3002<\/p>\n<p>Heap \u4e2d\u5305\u542b\u4e86\u521b\u5efa\u7684\u6240\u6709\u5bf9\u8c61\uff0c\u4e0d\u7ba1\u662f\u5728\u54ea\u4e2a\u7ebf\u7a0b\u4e2d\u521b\u5efa\u7684\uff0c\u8fd9\u4e5f\u5305\u62ec\u539f\u59cb\u7c7b\u578b\u7684\u5305\u88c5\u7c7b<\/p>\n<p>\u6bcf\u4e00\u4e2a\u7ebf\u7a0b\u90fd\u6709\u81ea\u5df1\u7684thread stack\uff0c\u7ebf\u7a0b\u6267\u884c\u540c\u6837\u7684\u65b9\u6cd5 \uff0c\u5176\u4e2d\u7684\u672c\u5730\u539f\u59cb\u53d8\u91cf\u662f\u5b58\u5728\u5404\u81ea\u7684\u8c03\u7528\u6808\u4e2d\u4e14\u4e92\u76f8\u4e0d\u53ef\u89c1\uff0c\u4f46\u662f\u53ef\u4ee5\u4f20\u9012\u539f\u59cb\u53d8\u91cf\u7684\u62f7\u8d1d\u7ed9\u5176\u5b83\u7ebf\u7a0b\u3002<\/p>\n<p>\u4ece\u786c\u4ef6\u6a21\u578b\u5c42\u9762\u548cJVM \u5185\u5b58\u6a21\u578b\u6765\u770b\uff0c\u4e3a\u4ec0\u4e48\u5728\u591a\u7ebf\u7a0b\u7684\u73af\u5883\u4e0b \u5982\u679c\u4e0d\u7528volatile\u4f1a\u51fa\u73b0\u95ee\u9898\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1309\" src=\"\/wp-content\/uploads\/2018\/02\/java-memory-model-4.png\" alt=\"\" width=\"452\" height=\"398\" srcset=\"https:\/\/blog.xiunian.wang\/wp-content\/uploads\/2018\/02\/java-memory-model-4.png 452w, https:\/\/blog.xiunian.wang\/wp-content\/uploads\/2018\/02\/java-memory-model-4-300x264.png 300w\" sizes=\"(max-width: 452px) 100vw, 452px\" \/><br \/>\n\u4e0a\u56fe\u4e2d\uff0c\u6bcf\u4e00\u4e2aCPU\u5305\u542b\u4e00\u7cfb\u5217\u5bc4\u5b58\u5668\u3002CPU \u8bbf\u95ee\u5bc4\u5b58\u5668\u7684\u901f\u5ea6&gt;\u7f13\u5b58&gt;\u4e3b\u5b58\uff0c\u56e0\u6b64\uff0c\u4e3a\u4e86\u9ad8\u6548\uff0c\u5f53\u4e00\u4e2a CPU \u9700\u8981\u8bfb\u53d6\u4e3b\u5b58\u65f6\uff0c\u5b83\u4f1a\u5c06\u4e3b\u5b58\u7684\u90e8\u5206\u8bfb\u5230 CPU \u7f13\u5b58\u4e2d\u3002\u5b83\u751a\u81f3\u53ef\u80fd\u5c06\u7f13\u5b58\u4e2d\u7684\u90e8\u5206\u5185\u5bb9\u8bfb\u5230\u5b83\u7684\u5185\u90e8\u5bc4\u5b58\u5668\u4e2d\uff0c\u7136\u540e\u5728\u5bc4\u5b58\u5668\u4e2d\u6267\u884c\u64cd\u4f5c\u3002\u5f53 CPU \u9700\u8981\u5c06\u7ed3\u679c\u5199\u56de\u5230\u4e3b\u5b58\u4e2d\u53bb\u65f6\uff0c\u5b83\u4f1a\u5c06\u5185\u90e8\u5bc4\u5b58\u5668\u7684\u503c\u5237\u65b0\u5230\u7f13\u5b58\u4e2d\uff0c\u7136\u540e\u5728\u67d0\u4e2a\u65f6\u95f4\u70b9\u5c06\u503c\u5237\u65b0\u56de\u4e3b\u5b58\u3002\u800c\u4e00\u4e2a\u7ebf\u7a0b\u8fd0\u884c\u5728\u4e0d\u540c\u7684CPU\u4e0a\u662f\u53ef\u80fd\u7684\u3002<\/p>\n<h4>java \u5185\u5b58\u6a21\u578b\u548c\u786c\u4ef6\u6a21\u578b\u7684\u5173\u7cfb<\/h4>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1311\" src=\"\/wp-content\/uploads\/2018\/02\/java-memory-model-5.png\" alt=\"\" width=\"817\" height=\"384\" srcset=\"https:\/\/blog.xiunian.wang\/wp-content\/uploads\/2018\/02\/java-memory-model-5.png 817w, https:\/\/blog.xiunian.wang\/wp-content\/uploads\/2018\/02\/java-memory-model-5-300x141.png 300w, https:\/\/blog.xiunian.wang\/wp-content\/uploads\/2018\/02\/java-memory-model-5-768x361.png 768w\" sizes=\"(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><br \/>\n\u5982\u56fe\u6240\u793a\uff1a\u786c\u4ef6\u5185\u5b58\u67b6\u6784\u4e0d\u533a\u5206java Thread Stack \u548cHeap \uff0c\u5728\u786c\u4ef6\u5c42\u9762\uff0cStack \u548cHeap \u90fd\u662f\u4f4d\u4e8e\u4e3b\u5b58\uff0c\u90e8\u5206\u6709\u65f6\u5019\u5728Cache \u6216\u8005cpu \u5bc4\u5b58\u5668\u4e2d\u8868\u73b0\u3002\u56e0\u6b64\u5e76\u4e0d\u77e5\u9053\u5f53\u524d\u7ebf\u7a0b\u662f\u5728\u90a3\u4e2aCPU \uff0cheap\u662f\u5728\u7f13\u5b58\u8fd8\u662f\u5728\u4e3b\u5b58\uff0c\u6240\u4ee5\u8fd0\u884c\u65f6\u4e0d\u77e5\u9053\u5bf9\u65b9\u7684\u53d8\u91cf\u7684\u72b6\u6001\u7684\u3002 \u611f\u89c9\u597d\u4e71\u3002\u6211\u4eec\u76f4\u63a5\u770b\u5b83\u89e3\u51b3\u4e86\u4ec0\u4e48\u95ee\u9898\u5427<\/p>\n<h3>volatile \u89e3\u51b3\u4e86\u4ec0\u4e48\u95ee\u9898\uff1f<\/h3>\n<p>\u4e00\u4e2a\u7ebf\u7a0b\u5728\u5de6\u8fb9cpu \u8fd0\u884c\u5e76\u5c06\u5171\u4eab\u53d8\u91cf\u62f7\u8d1d\u5230\u5b83\u7684cpu\u7f13\u5b58\uff0c\u4fee\u6539\u4e3a2 \uff0c\u8fd9\u4e2a\u6539\u52a8\u5bf9\u8fd0\u884c\u5728\u53f3\u8fb9\u7684\u7ebf\u7a0b\u4e0d\u53ef\u89c1\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u6539\u52a8\u5e76\u6ca1\u6709\u5237\u56de\u5230\u4e3b\u5b58\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1315\" src=\"\/wp-content\/uploads\/2018\/02\/java-memory-model-6.png\" alt=\"\" width=\"520\" height=\"393\" srcset=\"https:\/\/blog.xiunian.wang\/wp-content\/uploads\/2018\/02\/java-memory-model-6.png 520w, https:\/\/blog.xiunian.wang\/wp-content\/uploads\/2018\/02\/java-memory-model-6-300x227.png 300w\" sizes=\"(max-width: 520px) 100vw, 520px\" \/><\/p>\n<p>\u89e3\u51b3\u4e86\u8fd9\u4e2a\u95ee\u9898\u5c31\u662f\u6240\u8c13\u4fdd\u8bc1\u4e86\u53ef\u89c1\u6027\u3002 The Keyword volatile can make sure a given variable is read directly from main memory , and always written back to main memory when updated.<\/p>\n<h3>\u6307\u4ee4\u91cd\u6392<\/h3>\n<p>\u7a0b\u5e8f\u5728\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d \u4f1a\u5bf9\u4e00\u4e9b\u5355\u7ebf\u7a0b\u64cd\u4f5c\u7684\u8bed\u53e5\u8fdb\u884c\u91cd\u65b0\u6392\u5e8f\u3002\u6709\u4e24\u4e2a\u5c42\u9762\uff1a<br \/>\n\u5728\u865a\u62df\u673a\u5c42\u9762\uff0c\u4e3a\u4e86\u5c3d\u53ef\u80fd\u51cf\u5c11\u5185\u5b58\u64cd\u4f5c\u901f\u5ea6\u8fdc\u6162\u4e8eCPU\u8fd0\u884c\u901f\u5ea6\u6240\u5e26\u6765\u7684CPU\u7a7a\u7f6e\u7684\u5f71\u54cd\uff0c\u865a\u62df\u673a\u4f1a\u6309\u7167\u81ea\u5df1\u7684\u4e00\u4e9b\u89c4\u5219(\u8fd9\u89c4\u5219\u540e\u9762\u518d\u53d9\u8ff0)\u5c06\u7a0b\u5e8f\u7f16\u5199\u987a\u5e8f\u6253\u4e71\u2014\u2014\u5373\u5199\u5728\u540e\u9762\u7684\u4ee3\u7801\u5728\u65f6\u95f4\u987a\u5e8f\u4e0a\u53ef\u80fd\u4f1a\u5148\u6267\u884c\uff0c\u800c\u5199\u5728\u524d\u9762\u7684\u4ee3\u7801\u4f1a\u540e\u6267\u884c\u2014\u2014\u4ee5\u5c3d\u53ef\u80fd\u5145\u5206\u5730\u5229\u7528CPU<br \/>\n\u6307\u4ee4\u91cd\u6392\u5e8f\u662fJVM\u4e3a\u4e86\u4f18\u5316\u6307\u4ee4\uff0c\u63d0\u9ad8\u7a0b\u5e8f\u8fd0\u884c\u6548\u7387\uff0c\u5728\u4e0d\u5f71\u54cd\u5355\u7ebf\u7a0b\u7a0b\u5e8f\u6267\u884c\u7ed3\u679c\u7684\u524d\u63d0\u4e0b\uff0c\u5c3d\u53ef\u80fd\u5730\u63d0\u9ad8\u5e76\u884c\u5ea6\u3002\u7f16\u8bd1\u5668\u3001\u5904\u7406\u5668\u4e5f\u9075\u5faa\u8fd9\u6837\u4e00\u4e2a\u76ee\u6807\u3002\u6ce8\u610f\u662f\u5355\u7ebf\u7a0b\u3002\u591a\u7ebf\u7a0b\u7684\u60c5\u51b5\u4e0b\u6307\u4ee4\u91cd\u6392\u5e8f\u5c31\u4f1a\u7ed9\u7a0b\u5e8f\u5458\u5e26\u6765\u95ee\u9898\u3002<\/p>\n<p>\u4e0d\u540c\u7684\u6307\u4ee4\u95f4\u53ef\u80fd\u5b58\u5728\u6570\u636e\u4f9d\u8d56\u3002\u6bd4\u5982\u4e0b\u9762\u8ba1\u7b97\u5706\u7684\u9762\u79ef\u7684\u8bed\u53e5\uff1a<\/p>\n<p>[code lang=java]<br \/>\ndouble r = 2.3d;\/\/(1)<br \/>\ndouble pi =3.1415926; \/\/(2)<br \/>\ndouble area = pi* r * r; \/\/(3)<br \/>\narea\u7684\u8ba1\u7b97\u4f9d\u8d56\u4e8er\u4e0epi\u4e24\u4e2a\u53d8\u91cf\u7684\u8d4b\u503c\u6307\u4ee4\u3002\u800cr\u4e0epi\u65e0\u4f9d\u8d56\u5173\u7cfb\u3002<br \/>\n[\/code]<\/p>\n<p>as-if-serial\u8bed\u4e49\u662f\u6307\uff1a\u4e0d\u7ba1\u5982\u4f55\u91cd\u6392\u5e8f\uff08\u7f16\u8bd1\u5668\u4e0e\u5904\u7406\u5668\u4e3a\u4e86\u63d0\u9ad8\u5e76\u884c\u5ea6\uff09\uff0c\uff08\u5355\u7ebf\u7a0b\uff09\u7a0b\u5e8f\u7684\u7ed3\u679c\u4e0d\u80fd\u88ab\u6539\u53d8\u3002\u8fd9\u662f\u7f16\u8bd1\u5668\u3001Runtime\u3001\u5904\u7406\u5668\u5fc5\u987b\u9075\u5b88\u7684\u8bed\u4e49\u3002<\/p>\n<p>\u867d\u7136\uff0c\uff081\uff09 \u2013 happensbefore -&gt; \uff082\uff09,\uff082\uff09 \u2013 happens before -&gt; \uff083\uff09\uff0c\u4f46\u662f\u8ba1\u7b97\u987a\u5e8f(1)(2)(3)\u4e0e(2)(1)(3) \u5bf9\u4e8er\u3001pi\u3001area\u53d8\u91cf\u7684\u7ed3\u679c\u5e76\u65e0\u533a\u522b\u3002\u7f16\u8bd1\u5668\u3001Runtime\u5728\u4f18\u5316\u65f6\u53ef\u4ee5\u6839\u636e\u60c5\u51b5\u91cd\u6392\u5e8f\uff081\uff09\u4e0e\uff082\uff09\uff0c\u800c\u4e1d\u6beb\u4e0d\u5f71\u54cd\u7a0b\u5e8f\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u6307\u4ee4\u91cd\u6392\u5e8f\u5305\u62ec\u7f16\u8bd1\u5668\u91cd\u6392\u5e8f\u548c\u8fd0\u884c\u65f6\u91cd\u6392\u5e8f\u3002<\/p>\n<p>reference:<br \/>\n<a href=\"http:\/\/tutorials.jenkov.com\/java-concurrency\/java-memory-model.html\" target=\"_blank\" rel=\"noopener\">http:\/\/tutorials.jenkov.com\/java-concurrency\/java-memory-model.html<\/a><br \/>\n<a href=\"http:\/\/www.importnew.com\/23535.html\" target=\"_blank\" rel=\"noopener\">http:\/\/www.importnew.com\/23535.html<\/a><br \/>\n<a href=\"https:\/\/en.wikipedia.org\/wiki\/Happened-before\" target=\"_blank\" rel=\"noopener\">https:\/\/en.wikipedia.org\/wiki\/Happened-before<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Q\uff1a\u4f60\u5b66\u7684\u662fjava\uff1f A\uff1a\u662f\u7684\u3002\u5927\u5b66\u5b66\u8fc7\u3002 Q: \u90a3\u4f60\u8bf4\u8bf4java\u7684\u5173\u952e\u5b57volatile A: (\u5fc3\u60f3\uff1a\u53cc\u91cd\u9501\uff0c\u5355\u4f8b\u6a21\u5f0f\uff0cvolatile\u3002\u3002\u3002)volatile\u662f\u7528\u6765\u9632\u6b62\u6307\u4ee4\u91cd\u6392\u548c\u4fdd\u8bc1\u5185\u5b58\u53ef\u89c1\u3002 Q: \u5b83\u7684\u539f\u7406\u5462\uff1f A\uff1a(TMD\u539f\u7406\uff0c\u80af\u5b9a\u5c31\u662f\u548c\u865a\u62df\u673a\u6709\u5173\u5566NND\uff09\u53ea\u77e5\u9053\u7528\uff0c\u6ca1\u6709\u7814\u7a76\u8fc7\u8fd9\u4e2a\u3002 Q\uff1a\u597d\u5427\uff0c\u4f60\u8fd8\u6709\u4ec0\u4e48\u8981\u95ee\u7684\u561b\uff1f A\uff1a\u4f60\u4eec\u8fd9\u4e2a\u5c97\u4f4d\u671f\u5f85\u62db\u8058\u4ec0\u4e48\u6837\u7684\u4eba\uff1f Q\uff1a\u55ef\uff0c\u9ad8\u7ea7\u4e00\u70b9\u7684\u5427\u3002 A\uff1a\u54e6\u3002\u6ca1\u6709\u4e86\u3002 Q\uff1a\u90a3 \u56de\u53bb\u7b49\u6d88\u606f\u5427\u3002 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