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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.Such as sword analysis friendship tips: This strategy suggests that players have more than 3 months of experience before reading, otherwise it is likely to bypass yourself. If you fall into deep thought, Ben Meng Xin will not be responsible.上季结尾Lady Toni那一枪的确打中了Sam，但还不清楚子弹打在哪个部位。Sam不会死，因此不是致命伤。剧组证实，Rick Springfield将在第12季中扮演多集角色Vince Vicente，是Lucifer的宠臣。他是个摇滚明星，但已经在走下坡路，他渴望重拾往日的辉煌……于是他成了Lucifer的肉身容器。剧组还透露，Winchester兄弟的母亲Mary（Samantha Smith）将回归第12季，这会改变该剧的动态关系。Winchester兄弟在没有母亲的环境中长大成人，母亲对他们来说有点神秘。但Mary本质上和他们一样是个恶魔猎人，她将再次展现这一面。但Mary和两个儿子的重聚可能并不快乐，因为Mary在预告片中冷冷地告诉Dean：我从未想要你和Sam干这种事（猎魔）。Name of drug: Frangulae cortex该剧讲述两个黑道杀手在黑道组织当中是相互竞争的关系，其中一个被追杀之后成为警方线人又返回黑帮做卧底，另外一个想要脱离组织也被追杀，在此时警方派出了美丽女干探作卧底，最后几位合作和黑帮对决...