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@ Chen Baiyang3. 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.The two main attacks of model theft are:匈奴在越军的追击之下，一再溃败，几乎被吓破了胆子。曹氏忽然对她道：大嫂，不如让爹娘搬到正院来，老人家喜欢跟孙子孙女住一处，又亲香。如果小鱼儿誓死不从，苏樱会不会霸王硬上弓？还有。? There have been three industrial revolutions in human history. The industrial revolution has greatly promoted the development of productive forces, brought earth-shaking changes to people's lives, and also changed the original layout of the world's industry. The countries leading the industrial revolution have become the dominant powers in the world. The first industrial revolution made Britain's empire never set. The east wind of the second industrial revolution made the United States and Germany dominate the world. The third industrial revolution maintained the global hegemony of the United States.