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Policy pattern refers to defining a series of algorithms and encapsulating them. However, policy pattern not only encapsulates algorithms, but also encapsulates a series of business rules. As long as these business rules have the same objectives, we can use policy pattern to encapsulate them.Maintain the synchronization of material flow and information flow in production, so as to achieve the right quantity of materials, enter the right place at the right time, and produce the right quality products. This method can reduce inventory, shorten working hours, reduce costs and improve production efficiency."Ordinary attacks are all attacks and can attack twice. Do you like them?"《春风化雨》讲述10岁男孩蓝泾雨和8岁女孩金悦等一群性格各异、遭遇不同的山村留守儿童，在主人公张运老人自办的“留守儿童助教中心”一年间的生活、学习、成长的经历。青春期女孩琳琳和母亲的两人相依为命，琳母对其极为严苛，琳母更是因为年轻时的情殇，反对琳琳与异性有任何来往，然后事与愿违，这花季年龄怎能抵挡爱情的诱惑呢。琳琳发现其母犹如鬼魅般形影相随，所到之处无不见其身影，怪事也接二连三……到底是琳母所为的还是别有隐情？一场意外的停电事件开启了古镇的诅咒，民宿老板讲述了关于提琴的传说，四人觉得此事极其荒诞、难以置信。然而恐怖的事情接连发生，众人早已在琴声响起之时就陷入了一场无法退出的死亡游戏之中，他们一个个离奇的失踪…恐怖笼罩着整个古镇，究竟谁是凶手？比鬼神更可怕的是人心，猜忌和怀疑在弥散，恐惧和杀戮在继续，真相如何？结局峰回路转，既出人意料，又在情理之中越军在四处守卫巡逻，气氛依然有些紧张，以至于很多的范家下人都没搞清楚是怎么回事。