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When "cracking" the sand pile paradox, we often have to set a fixed boundary. If we say "10,000 grains of sand are a pile of sand", then less than 10,000 grains of sand cannot be called a pile of sand. Then it is somewhat unreasonable to distinguish 9999 grains of sand from 10001 grains of sand. This has to set a variable boundary, but what is this boundary? We don't know now. Then the value of "10,000 grains of sand are a pile of sand" originally set as knowledge will be reduced.The above is compiled from the post-war oral memories of Kang Yuanlian, the company commander of the 2nd Company who took part in the 142 battle earlier, and Liu Guangyuan, Wang Zeduan and Zhao Mingkai, the soldiers who were responsible for guarding the 142 position and took part in the whole process of fighting the two "living biological weapons" of the Vietnamese army.If the blog park still has an interface that pays more attention and has restricted POST, but the content of the blog post is posted directly into HTML (unfiltered), it will be attacked by XSS. Then you can directly embed the above code into the blog post, so as long as someone opens my blog post, they will still pay attention to me automatically. This combined attack method is called XSRF.没错，魏豹现在就是希望刘邦战败。两人含笑相视，却不说话，仿佛忘了周围的人。影片是08年《死亡飞车》的前传。辛刚轻轻点点头：这一剑是拜尹旭所赐，他手中的那把剑异常锋利，名曰断水，出自越王勾践。