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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.Rui Yi interviewed some parents who chose to cultivate their children's thinking ability. One of the parents said, "In fact, our parents don't want to bring academic pressure to their children too early, However, I am afraid that there is no foundation. The gap between children and their classmates will gradually widen after school. With so many children in a class, teachers cannot take care of a certain child alone. We teach ourselves. First, we don't know how to teach and what to teach. Second, we don't have so much time. "刘氏见了她，依旧温和地笑着招呼道：淼淼，你昨晚跟小葱一块陪蝉儿了？嗳哟。啊……他愣了一下，放下腿，转身呆滞回望小艇。年近三十成绩平平的编剧萧渝（papi酱 饰）与同样才华无法变现的音乐人季野（张超 饰）意外成为合租室友，啼笑皆非的同居生活中，二人渐生情愫。现实打击梦想，但他俩相互陪伴，彼此鼓励。在或许不太好的今天苦中作乐，并坚信——明天会好的！　　但内心深处有着不为人知的伤痛，与朴理焕（李栋旭饰演）从幼时相识感情深厚。These are the inherent characteristics of the six-channel model at present.