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Cannot use the with statementThe content of the website is stored on the source server, and the CDN is the cache of the content. Users are only allowed to access the CDN. If the content is not on the CDN, the CDN sends a request to the source server. In this way, as long as the CDN is large enough, it can resist great attacks. However, this method has a premise that most of the content of the website must be statically cached. For websites (such as forums) with dynamic content as the main content, we must think of other ways to minimize users' requests for dynamic data.平定江东的楚国大将项燕之子项梁接陈王诏命，任上柱国，以校尉英布、尹旭、虞子期为副将，率两万大军由会稽渡江北上，声讨叛逆景驹、秦嘉。Similar to the development of children from appearance and color to older children, they can be classified according to concepts. For example, if they know the concept of "food", no matter what kind of vegetables they look like, they should be classified into one category. The classification of biology has also developed in this way. The earliest method is to identify and distinguish species according to phenotypic characteristics, and to classify them step by step according to the degree of phenotypic similarity, so as to establish a classification system that is easy to retrieve. This is the principle of phenotypic classification. However, the problem of phenotypic classification is that it is difficult to reveal the essential laws of things. Many creatures with very different shapes may have kinship relationships. For example, the online sentence "When I knew sunflowers belonged to Compositae, I collapsed" is what it means.庄稼人越发忙碌起来，田间地头，河渠水塘，到处都是人影，或是查看结穗的稻禾，或是在山芋黄豆地薅草浇水，或是在菜地里浇粪等等。嘉靖闻言嗤笑道，东南的事，一个蓟辽总督也如此紧张么？他说着，回身接过奏疏，匆匆一阅后又还给徐阶。动画片《少年师爷》是绍兴首部原创动画片，以水乡绍兴为背景，主人公施恩是一位机智可爱，喜欢替人打抱不平的小少年，该片讲述施恩和小伙伴们的欢乐小故事，启发观众思考，动画片制作精良，似缓缓展开的一轴绍兴特色江南画卷。