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3. Some types, such as the core trading engine of the exchange, control the trading process. If multiple types can be created, the system will be completely chaotic. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process. The following is an analysis of some examples that we need to pay attention to when applying singleton pattern in the development process.两名被栽赃的毒贩为躲避追杀，混上了一辆救护车。夜间迷路，燃油耗尽，天亮被困雪山高原。杀手逼近，却同样被困雪山、生命垂危，究竟该何去何从？双方交战身份被识破，究竟谁才是幕后凶手？谁又会迷途知返？(未完待续……) show_style();。　　赵督军在戏园里听名角紫苏唱戏。柳爷赶来欲要回自己的大洋。谁知白风寨的唐景骑马冲进戏院，对着赵督军甩手一枪……混乱中，柳云轩护住柳爷往外逃，并伺机开枪打死了赵督军。柳云轩的举动震惊了柳爷，柳爷让他做柳家大院的师爷。 　　宁檬一直有一个成为投资总监的职业梦想，可毕业后做的工作却与梦想相距甚远。她的上司陆既明是一个业务能力极强的投资总裁，他不认为宁檬也能成为合格的投资人。某一天宁檬终于下定决心离开陆既明，向他也向自己证明她可以做到。宁檬重新求职，经过种种阻碍，机缘下最终进入了鹰石投资，开始了她的晋升之路。过程中陆既明也在关注着宁檬，起初他不认可，但在重要关头还是会对宁檬进行提点，帮助她度过难关。陆既明长远的投资理念使宁檬获益匪浅，宁檬也改变了陆既明的处世态度。两人互相影响，携手并进，经历了无数的波折和风浪之后，宁檬蜕变成为了独当一面的金牌投资人，陆既明也历练得更加成熟有担当。他们认定彼此就是自己最正确的那个人。依旧是往西边伸手。是任盈盈宽宏大度，豁达宽容？不。