{"id":367,"date":"2024-02-21T15:51:56","date_gmt":"2024-02-21T07:51:56","guid":{"rendered":"https:\/\/www.lightnode.cn\/knowledge\/?p=367"},"modified":"2026-07-24T18:12:36","modified_gmt":"2026-07-24T10:12:36","slug":"%e4%bb%80%e4%b9%88%e6%98%afcn2%e7%ba%bf%e8%b7%af%ef%bc%9fcn2%e5%92%8ccn2-gia%e6%9c%89%e4%bb%80%e4%b9%88%e5%8c%ba%e5%88%ab%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.ygcloud.com\/knowledge\/367\/","title":{"rendered":"CN2\u7ebf\u8def\u662f\u4ec0\u4e48\uff1fCN2 GIA\u3001GT\u3001163\u548cBGP\u600e\u4e48\u8fa8\u522b"},"content":{"rendered":"<section data-seo-update=\"20260724-367\">\n<p><strong>\u5148\u8bf4\u7ed3\u8bba\uff1a<\/strong>\u201cCN2\u201d\u201cCN2 GIA\u201d\u201cCN2 GT\u201d\u201c\u4e09\u7f51 GIA\u201d\u5728\u96f6\u552e VPS \u9875\u9762\u4e0a\u5e38\u88ab\u5f53\u4f5c\u8425\u9500\u6807\u7b7e\uff0c\u4f46\u4e0d\u662f\u770b\u5230 59.43\u3001AS4809 \u6216\u4e00\u5f20 traceroute \u5c31\u80fd\u5b8c\u5168\u8bc1\u660e\u7684\u56fa\u5b9a\u8d28\u91cf\u7b49\u7ea7\u3002\u4e2d\u56fd\u7535\u4fe1\u56fd\u9645\u7684 GIA \u662f\u4f01\u4e1a\u4e92\u8054\u7f51\u63a5\u5165\u670d\u52a1\uff1b\u5177\u4f53 VPS \u662f\u5426\u4f7f\u7528\u3001\u8986\u76d6\u54ea\u4e2a\u65b9\u5411\u548c\u8fd0\u8425\u5546\u3001\u5e26\u5bbd\u4e0e\u62e5\u585e\u5982\u4f55\uff0c\u5fc5\u987b\u7ed3\u5408\u4ea7\u54c1\u8bf4\u660e\u3001\u53bb\u56de\u7a0b\u3001\u591a\u8fd0\u8425\u5546\u3001\u9ad8\u5cf0\u6d4b\u8bd5\u548c\u771f\u5b9e\u5e94\u7528\u9a8c\u6536\u3002<\/p>\n<figure>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-370\" src=\"https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/484d422468c8b09.webp\" alt=\"CN2 GIA\u56fd\u9645\u7ebf\u8def\u4e0e\u666e\u901a\u4e92\u8054\u7f51\u8def\u5f84\u5bf9\u6bd4\" width=\"500\" height=\"500\" srcset=\"https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/484d422468c8b09.webp 1024w, https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/484d422468c8b09-300x300.webp 300w, https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/484d422468c8b09-150x150.webp 150w, https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/484d422468c8b09-768x768.webp 768w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption>\u8fd0\u8425\u5546\u4ea7\u54c1\u3001\u8def\u7531\u8def\u5f84\u3001\u96f6\u552e\u6807\u7b7e\u548c\u7528\u6237\u4f53\u9a8c\u662f\u56db\u4e2a\u5c42\u6b21\u3002<\/figcaption><\/figure>\n<h2>CN2 \u4e0e CN2 GIA \u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>CN2 \u901a\u5e38\u6307\u4e2d\u56fd\u7535\u4fe1\u5efa\u8bbe\u7684\u65b0\u4e00\u4ee3\u627f\u8f7d\u7f51\u7edc\u3002<a href=\"https:\/\/www.chinatelecomglobal.com\/expertises\/productservices\/2457\/2496\">\u4e2d\u56fd\u7535\u4fe1\u56fd\u9645 Global Internet Access<\/a>\u9762\u5411\u4f01\u4e1a\u63d0\u4f9b\u5168\u7403\u4e92\u8054\u7f51\u63a5\u5165\u3001\u4e2d\u56fd\u65b9\u5411\u8fde\u63a5\u3001\u76d1\u63a7\u4e0e SLA \u7b49\u80fd\u529b\u3002<\/p>\n<p>\u96f6\u552e VPS \u5e76\u4e0d\u662f\u76f4\u63a5\u628a\u8fd0\u8425\u5546\u4f01\u4e1a\u5408\u540c\u539f\u6837\u8f6c\u552e\u7ed9\u6bcf\u4e2a\u7528\u6237\u3002\u673a\u623f\u3001\u4e0a\u6e38\u3001\u7aef\u53e3\u3001\u5171\u4eab\u6bd4\u4f8b\u3001\u56de\u7a0b\u7b56\u7565\u548c\u4f9b\u5e94\u5546\u91c7\u8d2d\u65b9\u5f0f\u90fd\u4f1a\u5f71\u54cd\u6700\u7ec8\u8868\u73b0\uff0c\u56e0\u6b64 GIA \u540d\u79f0\u53ea\u80fd\u7528\u4e8e\u5efa\u7acb\u5019\u9009\uff0c\u4e0d\u80fd\u66ff\u4ee3\u8bc1\u636e\u3002<\/p>\n<h2>\u5e38\u89c1\u540d\u79f0\u600e\u6837\u7406\u89e3\uff1f<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u540d\u79f0<\/th>\n<th>\u901a\u5e38\u60f3\u8868\u8fbe<\/th>\n<th>\u4e0d\u80fd\u636e\u6b64\u65ad\u8a00<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>163 \/ ChinaNet<\/td>\n<td>\u4f20\u7edf\u516c\u4f17\u4e92\u8054\u7f51\u9aa8\u5e72\u65b9\u5411<\/td>\n<td>\u6240\u6709\u5730\u533a\u90fd\u62e5\u585e\u6216\u4e00\u5b9a\u6162<\/td>\n<\/tr>\n<tr>\n<td>CN2<\/td>\n<td>\u8def\u5f84\u6d89\u53ca CN2 \u627f\u8f7d\u7f51\u7edc<\/td>\n<td>\u53bb\u56de\u7a0b\u3001\u4e09\u7f51\u3001\u5168\u7a0b\u90fd\u4e00\u81f4<\/td>\n<\/tr>\n<tr>\n<td>CN2 GIA<\/td>\n<td>\u66f4\u9ad8\u7b49\u7ea7\u7684\u4e2d\u56fd\u7535\u4fe1\u56fd\u9645\u63a5\u5165\u65b9\u5411<\/td>\n<td>\u6240\u6709\u65f6\u6bb5\u96f6\u4e22\u5305\u6216\u56fa\u5b9a\u5ef6\u8fdf<\/td>\n<\/tr>\n<tr>\n<td>CN2 GT<\/td>\n<td>\u5e02\u573a\u5bf9\u90e8\u5206 CN2 \u8def\u5f84\u7684\u5e38\u89c1\u8bf4\u6cd5<\/td>\n<td>\u5b58\u5728\u5168\u7403\u7edf\u4e00\u3001\u53ef\u5ba1\u8ba1\u7684\u96f6\u552e\u5b9a\u4e49<\/td>\n<\/tr>\n<tr>\n<td>\u4e09\u7f51 GIA\/\u4f18\u5316<\/td>\n<td>\u5ba3\u79f0\u7535\u4fe1\u3001\u8054\u901a\u3001\u79fb\u52a8\u5747\u6709\u4f18\u5316<\/td>\n<td>\u4e09\u4e2a\u8fd0\u8425\u5546\u53cc\u5411\u5168\u7a0b\u4f7f\u7528\u540c\u4e00\u7f51\u7edc<\/td>\n<\/tr>\n<tr>\n<td>BGP<\/td>\n<td>\u901a\u8fc7 BGP \u4e0e\u4e0a\u6e38\u4ea4\u6362\u8def\u7531<\/td>\n<td>\u81ea\u52a8\u9009\u62e9\u6bcf\u4f4d\u7528\u6237\u7684\u6700\u4f4e\u5ef6\u8fdf\u8def\u5f84<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-368\" src=\"https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/f65f846f02a5220-1022x1024.jpg\" alt=\"CN2\u7ebf\u8def\u53bb\u7a0b\u56de\u7a0b\u4e0e\u4e09\u7f51\u6d4b\u8bd5\" width=\"500\" height=\"501\" srcset=\"https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/f65f846f02a5220-1022x1024.jpg 1022w, https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/f65f846f02a5220-300x300.jpg 300w, https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/f65f846f02a5220-150x150.jpg 150w, https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/f65f846f02a5220-768x769.jpg 768w, https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2024\/02\/f65f846f02a5220.jpg 1144w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption>\u540c\u4e00\u4ea7\u54c1\u4e5f\u8981\u5206\u522b\u9a8c\u8bc1\u7535\u4fe1\u3001\u8054\u901a\u3001\u79fb\u52a8\u7684\u53bb\u7a0b\u3001\u56de\u7a0b\u548c\u9ad8\u5cf0\u3002<\/figcaption><\/figure>\n<h2>AS4809 \u548c 59.43 \u80fd\u8bc1\u660e\u4ec0\u4e48\uff1f<\/h2>\n<p>ASN\u3001IP \u7f51\u6bb5\u548c\u4e3b\u673a\u540d\u53ef\u4ee5\u8bf4\u660e\u67d0\u4e9b\u8df3\u70b9\u7684\u8fd0\u8425\u4e3b\u4f53\u6216\u8def\u5f84\u7ebf\u7d22\uff0c\u4f46\u5b58\u5728\u4ee5\u4e0b\u9650\u5236\uff1a<\/p>\n<ul>\n<li>traceroute \u901a\u5e38\u53ea\u663e\u793a\u53bb\u7a0b\uff0c\u56de\u7a0b\u53ef\u80fd\u4e0d\u540c\uff1b<\/li>\n<li>\u4e00\u4e2a\u8df3\u70b9\u51fa\u73b0\u4e0d\u4ee3\u8868\u5b8c\u6574\u8def\u5f84\u90fd\u4f7f\u7528\u8be5\u7f51\u7edc\uff1b<\/li>\n<li>\u4e0d\u540c\u4e2d\u56fd\u8fd0\u8425\u5546\u548c\u7701\u4efd\u53ef\u80fd\u8d70\u4e0d\u540c\u4e0a\u6e38\uff1b<\/li>\n<li>\u8def\u7531\u5668\u53ef\u80fd\u4e0d\u56de\u590d\u6216\u964d\u4f4e ICMP \u4f18\u5148\u7ea7\uff1b<\/li>\n<li>\u8def\u7531\u4f1a\u56e0\u6545\u969c\u3001\u7ef4\u62a4\u3001\u62e5\u585e\u548c\u7b56\u7565\u6539\u53d8\uff1b<\/li>\n<li>\u6700\u7ec8\u4f53\u9a8c\u8fd8\u53d7\u7aef\u53e3\u3001\u8d85\u552e\u3001\u4e3b\u673a\u548c\u5e94\u7528\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<p>\u56e0\u6b64\u201c\u770b\u5230 59.43 \u5c31\u662f\u5168\u7a0b GIA\u201d\u4e0e\u201c\u6ca1\u770b\u5230\u5c31\u662f\u5047\u7ebf\u8def\u201d\u90fd\u8fc7\u4e8e\u7b80\u5355\u3002<\/p>\n<h2>\u6309\u4e1a\u52a1\u5224\u65ad\u662f\u5426\u9700\u8981 CN2 GIA<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u4e1a\u52a1<\/th>\n<th>CN2\/GIA \u6743\u91cd<\/th>\n<th>\u66f4\u91cd\u8981\u7684\u9a8c\u8bc1<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u4e2d\u56fd\u56e2\u961f\u8fd0\u7ef4\u6d77\u5916\u7cfb\u7edf<\/td>\n<td>\u4e2d\u9ad8<\/td>\n<td>\u4e09\u7f51 SSH\/RDP\u3001\u4e0a\u4f20\u3001\u9ad8\u5cf0\u7a33\u5b9a\u6027<\/td>\n<\/tr>\n<tr>\n<td>\u4e2d\u56fd\u5927\u9646\u7528\u6237\u8bbf\u95ee\u6d77\u5916\u7f51\u7ad9<\/td>\n<td>\u4e2d\u9ad8<\/td>\n<td>\u771f\u5b9e\u9875\u9762\u3001API P95\u3001CDN \u4e0e\u5408\u89c4<\/td>\n<\/tr>\n<tr>\n<td>\u4e3b\u8981\u7528\u6237\u5728\u6b27\u7f8e<\/td>\n<td>\u4f4e<\/td>\n<td>\u5f53\u5730\u4e92\u8054\u3001\u6e90\u7ad9\u4f4d\u7f6e\u3001\u5e26\u5bbd\u4e0e\u7528\u6237\u4f53\u9a8c<\/td>\n<\/tr>\n<tr>\n<td>\u5907\u4efd\u4e0e\u5927\u6587\u4ef6<\/td>\n<td>\u4e2d<\/td>\n<td>\u6301\u7eed\u541e\u5410\u3001\u6d41\u91cf\u3001\u91cd\u4f20\u4e0e\u6210\u672c<\/td>\n<\/tr>\n<tr>\n<td>\u6e38\u620f\/\u5b9e\u65f6\u4ea4\u4e92<\/td>\n<td>\u9ad8\u4f46\u975e\u552f\u4e00<\/td>\n<td>\u771f\u5b9e\u534f\u8bae\u3001\u6296\u52a8\u3001\u7ec8\u70b9\u4e22\u5305\u548c\u5355\u6838\u6027\u80fd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>7 \u6b65\u6838\u9a8c\u7ebf\u8def<\/h2>\n<ol>\n<li>\u7d22\u53d6\u4e0e\u5f85\u8d2d\u57ce\u5e02\u3001\u673a\u623f\u548c\u4ea7\u54c1\u4e00\u81f4\u7684\u6d4b\u8bd5 IP\uff1b<\/li>\n<li>\u786e\u8ba4\u4f9b\u5e94\u5546\u5bf9 CN2\/GIA \u7684\u4e66\u9762\u5b9a\u4e49\u548c\u8986\u76d6\u65b9\u5411\uff1b<\/li>\n<li>\u4ece\u7535\u4fe1\u3001\u8054\u901a\u3001\u79fb\u52a8\u53ca\u4e3b\u8981\u7701\u4efd\u5206\u522b\u6d4b\u8bd5\uff1b<\/li>\n<li>\u53d6\u5f97\u56de\u7a0b Looking Glass \u6216\u670d\u52a1\u5668\u4fa7 MTR\uff1b<\/li>\n<li>\u8fde\u7eed 3\u20137 \u5929\u8986\u76d6\u665a\u9ad8\u5cf0\uff0c\u8bb0\u5f55 P50\/P95\u3001\u6296\u52a8\u548c\u7ec8\u70b9\u4e22\u5305\uff1b<\/li>\n<li>\u90e8\u7f72\u540c\u4e00\u5e94\u7528\uff0c\u6d4b DNS\u3001TLS\u3001TTFB\u3001\u9875\u9762\/API \u548c\u9519\u8bef\u7387\uff1b<\/li>\n<li>\u540c\u65f6\u76d1\u63a7 CPU\u3001\u78c1\u76d8\u3001\u5e26\u5bbd\u548c\u5e94\u7528\u65e5\u5fd7\uff0c\u6392\u9664\u4e3b\u673a\u74f6\u9888\u3002<\/li>\n<\/ol>\n<p>\u547d\u4ee4\u4e0e\u7ed3\u679c\u89e3\u91ca\u53ef\u6309<a href=\"https:\/\/www.ygcloud.com\/knowledge\/1412\/\">\u6d77\u5916 VPS \u6d4b\u8bd5 IP \u6307\u5357<\/a>\u548c<a href=\"https:\/\/www.ygcloud.com\/knowledge\/1761\/\">\u6d4b\u901f\u62a5\u544a\u9605\u8bfb\u65b9\u6cd5<\/a>\u6267\u884c\u3002<\/p>\n<h2>\u91c7\u8d2d\u65f6\u8fd8\u8981\u6bd4\u8f83\u4ec0\u4e48\uff1f<\/h2>\n<ul>\n<li>\u7aef\u53e3\u5cf0\u503c\u3001\u4fdd\u8bc1\u5e26\u5bbd\u3001\u6708\u6d41\u91cf\u4e0e\u516c\u5e73\u4f7f\u7528\uff1b<\/li>\n<li>\u4e2d\u56fd\u65b9\u5411\u548c\u56fd\u9645\u65b9\u5411\u662f\u5426\u4f7f\u7528\u4e0d\u540c\u4e0a\u6e38\uff1b<\/li>\n<li>IPv4\/IPv6\u3001DDoS\u3001IP \u66f4\u6362\u548c\u9ed1\u6d1e\u89c4\u5219\uff1b<\/li>\n<li>CPU\u3001\u5185\u5b58\u3001\u78c1\u76d8\u548c\u5bbf\u4e3b\u8d44\u6e90\uff1b<\/li>\n<li>\u5feb\u7167\u3001\u7ad9\u5916\u5907\u4efd\u3001SLA\u3001\u652f\u6301\u4e0e\u8fc1\u79fb\uff1b<\/li>\n<li>\u7eed\u8d39\u3001\u8d85\u989d\u6d41\u91cf\u548c\u957f\u671f\u603b\u6210\u672c\u3002<\/li>\n<\/ul>\n<p>\u7ebf\u8def\u5f88\u597d\u4f46\u5e94\u7528\u65e0\u6cd5\u6062\u590d\u3001\u7aef\u53e3\u4e0d\u8db3\u6216\u6210\u672c\u4e0d\u53ef\u63a7\uff0c\u540c\u6837\u4e0d\u80fd\u4e0a\u7ebf\u3002<\/p>\n<h2>CN2 GIA \u4e0e CDN\u3001BGP\u662f\u4ec0\u4e48\u5173\u7cfb\uff1f<\/h2>\n<p>BGP \u662f\u4ea4\u6362\u548c\u9009\u62e9\u8def\u7531\u7684\u534f\u8bae\uff0cCN2\/GIA \u662f\u8fd0\u8425\u5546\u7f51\u7edc\u4e0e\u63a5\u5165\u670d\u52a1\u63cf\u8ff0\uff1b\u4e24\u8005\u53ef\u4ee5\u540c\u65f6\u5b58\u5728\u3002CDN \u662f\u5e94\u7528\u5c42\u8fb9\u7f18\u7f13\u5b58\u4e0e\u4ee3\u7406\uff0c\u9002\u5408\u9759\u6001\u8d44\u6e90\u548c\u90e8\u5206 Web \u6d41\u91cf\uff0c\u4e0d\u4f1a\u81ea\u52a8\u4f18\u5316 SSH\u3001\u6570\u636e\u5e93\u548c\u6240\u6709\u52a8\u6001 API\u3002\u5b8c\u6574\u5173\u7cfb\u53ef\u770b<a href=\"https:\/\/www.ygcloud.com\/knowledge\/1426\/\">CN2\u3001BGP \u4e0e\u56fd\u9645\u7ebf\u8def\u9009\u62e9<\/a>\u548c<a href=\"https:\/\/www.ygcloud.com\/knowledge\/269\/\">CDN \u9009\u578b<\/a>\u3002<\/p>\n<h2>\u600e\u6837\u628a\u8424\u5149\u4e91\u7ebf\u8def\u52a0\u5165\u5019\u9009\uff1f<\/h2>\n<p>\u5148\u786e\u5b9a\u7528\u6237\u4f4d\u7f6e\u548c\u4e1a\u52a1\u9608\u503c\uff0c\u518d\u5230<a href=\"https:\/\/www.ygcloud.com\/vps\/\">\u8424\u5149\u4e91 VPS \u4ea7\u54c1\u9875<\/a>\u6838\u5bf9\u76ee\u6807\u8282\u70b9\u5f53\u524d\u7ebf\u8def\u3001\u7aef\u53e3\u3001\u6d41\u91cf\u548c\u5e93\u5b58\u3002\u82e5\u4ea7\u54c1\u5199\u6709 CN2\/GIA\uff0c\u4ecd\u6309\u672c\u6587\u65b9\u6cd5\u505a\u53cc\u5411\u3001\u591a\u7f51\u3001\u9ad8\u5cf0 PoC\u3002\u6b27\u6d32\u65b9\u5411\u53ef\u7ed3\u5408<a href=\"https:\/\/www.ygcloud.com\/knowledge\/283\/\">\u6b27\u6d32 CN2 GIA \u6d4b\u8bd5\u4e0e\u9009\u8d2d<\/a>\u3002<\/p>\n<h2>\u5e38\u89c1\u95ee\u9898<\/h2>\n<h3>CN2 GIA \u4e00\u5b9a\u6bd4\u56fd\u9645 BGP \u5feb\u5417\uff1f<\/h3>\n<p>\u4e0d\u4e00\u5b9a\u3002\u5bf9\u4e2d\u56fd\u65b9\u5411\u53ef\u80fd\u66f4\u6709\u4f18\u52bf\uff0c\u5bf9\u6d77\u5916\u5f53\u5730\u7528\u6237\u5219\u8981\u6bd4\u8f83\u5f53\u5730\u4e92\u8054\u548c\u5b9e\u9645\u8def\u5f84\u3002<\/p>\n<h3>\u4e00\u6b21 traceroute \u80fd\u9a8c\u771f\u5417\uff1f<\/h3>\n<p>\u4e0d\u80fd\u3002\u81f3\u5c11\u9700\u8981\u53bb\u56de\u7a0b\u3001\u591a\u8fd0\u8425\u5546\u3001\u591a\u65f6\u6bb5\u548c\u5e94\u7528\u6307\u6807\u3002<\/p>\n<h3>\u4e09\u7f51 GIA 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href=\"https:\/\/www.ygcloud.com\/knowledge\/1947\/\">\u6d77\u5916\u4e91\u670d\u52a1\u5668\u5730\u57df\u9009\u62e9<\/a><\/li>\n<\/ul>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>\u5148\u8bf4\u7ed3\u8bba\uff1a\u201cCN2\u201d\u201cCN2 GIA\u201d\u201cCN2 GT\u201d\u201c\u4e09\u7f51 GIA\u201d\u5728\u96f6\u552e VPS \u9875\u9762\u4e0a\u5e38\u88ab\u5f53\u4f5c\u8425\u9500\u6807\u7b7e\uff0c\u4f46\u4e0d\u662f\u770b\u5230 59.43\u3001AS4809 \u6216\u4e00\u5f20 traceroute \u5c31\u80fd\u5b8c\u5168\u8bc1\u660e\u7684\u56fa\u5b9a\u8d28\u91cf\u7b49\u7ea7\u3002\u4e2d\u56fd\u7535\u4fe1\u56fd\u9645\u7684 GIA 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