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3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (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.Peripheral functions are defined as slices in Spring's AOP idea of slice-oriented programming.那种危急的情况下，龙且也是不得而为之，何况龙且还为此身受重伤，怎么好怪罪呢？项羽一摆手，说道：杀就杀了吧。又道，她比青鸾好呢，我好喜欢她。因此韩信没有犹豫，立即答应了此事。Before proxy!According to CCTV News Client, on the morning of October 15, the staff of Tunliu County Party Committee Propaganda Department said that the local government had found the rumor of the county Party Committee's reorganization of the county discipline inspection commission team in WeChat Circle of Friends yesterday and had reported the matter to Tunliu County Public Security Bureau.