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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.In the system, how do we need to reuse an object, if we repeatedly use the new operator to create the object at this time, it is a great waste of system resources. Since we use the same object every time, why can't we share it? This is also the reason why the model of enjoying yuan appears.2006年，某广告公司文案蒋亮亮（冯绍峰饰）和演员喵喵（倪妮饰）相会于熙攘喧嚣的北京街头。他搭乘着从富二代车中出来后贸然坐入他车中的喵喵，与对方的兰博基尼相互飙车，看似见义勇为，却也给自己引来不小的麻烦。因工作关系，亮亮与喵喵再度相逢，二人相谈甚欢，别样的情感在彼此心底悄然升起。闹市的莫大孤独感，最终让两人走到一起。他们在北京一角同居，体会着属于两人的微妙幸福感。只是虚妄的幸福过后，裂痕在他们心间产生。亮亮号称对女性有“不主动、不拒绝、不负责”三大原则，而他和包括前女友梅梅等女性之间藕断丝连、暧昧之情也让喵喵心中滋生种种不安。这条路，他们该如何走下去……他听见身后没有动静，悄悄侧身扭头，见林聪背对着自己，不由大大松了口气。1942年,日本鬼子实施铁壁合围,对山东人民进行惨绝人寰的屠杀,在团长崔洪年的带领下,八路军舍生忘死营救百姓,与山东人民结下骨肉深情。Pretending to be "pregnant" in June, she applied to the company for maternity leave. When the company asked her to provide a certificate, she got the pregnancy certificate in the hands of Western medicine Wang Zhigang and could also infer that her expected date of delivery was September 13 last year. 　　The first one will last for 3 minutes, and the second one will last for 1 minute.