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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.The learning platform launched on that day is called "Learning Power". No matter from the time node, the attendees or even the names of the platform, it obviously has a very heavy weight.在一间房子共同生活的故事再次展开！The above is compiled from the post-war oral memories of Kang Yuanlian, the company commander of the 2nd Company who took part in the 142 battle earlier, and Liu Guangyuan, Wang Zeduan and Zhao Mingkai, the soldiers who were responsible for guarding the 142 position and took part in the whole process of fighting the two "living biological weapons" of the Vietnamese army.