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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.徐建后背一片冰凉，现在徐家的生死完全握在尹旭手中，虽说自己现在有他最想要的东西。How many men think that I am the best man if I don't gamble, cheat and work hard to earn money. How can women be so difficult to satisfy?一位青年男子作为成年礼派对主持人，与一位母亲和她患有自闭症的女儿建立了友谊。至于具体罪名，不说御史，街上随便一个孩童都能列出来许多。The following is the definition of the factory method: an interface is defined to create an object, but the subclass decides which one to create. The factory method defers this process of creating objects to subclasses.