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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.南瓜听了一震，细想了一回，躬身道：谢父亲教诲。玉米正好住在西边。魏小玲（欧阳妮妮饰）是个电玩公司游戏测试员，不过看似平凡的她却能看到“渣渣”，也就是有着阴阳眼的“脑波小姐”。因为小玲能看到渣渣，也被一位来自清朝转世失败的渣渣缠身，要她帮忙转世，就附身到他的上司时大永（张书豪饰）身上，而冷酷的大永个性变得阴晴不定。　　转眼过了数年，星际探险员赛小息、天才机械师卡璐璐和宇宙战士阿铁打奉命维修飞船，却被遥远星系突如其来的神秘爆炸震散，流落四方生死未卜……赛尔先锋精英小队星际探险的航程难道就要在此终止了吗……三股势力围绕着宝盒展开了一场西域宝盒追缉战。