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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.齐楚边境，大战还在进行之中，虽然西楚国实力明显强大，项羽也更为霸道勇猛。极具特色的旅程和高风险的医疗救援，编织成了空中医疗队在三万米高空上的生死悲欢。我们将见证年轻护士和空中救护车飞行员，在加拿大北部荒原上的胜利、心碎和烦恼。他们在天上，无人依赖，只有他们彼此。上海富商童执中有三个女儿，人称“童氏三花”，大女儿童寒云，嫁给了日本人东野太郎，而东野真正的身份是共产国际潜伏在日军内部的情报员，为了理想正义，而牺牲了生命；二女儿童秋林，经过了我党的情报训练，变成了一位优秀的女情报员，与日寇的情报首脑洞井，暗中较智，成功取得了许多重要的情报，逼使洞井羞愤自尽；三女儿童春银，误入歧途，加入了国民党的情报组织，命运坎坷，最后与日本女特务同归于尽；她们的父亲童执中真正的身份则是我党高层的情报首脑，这一家人，为了抗日救国，作出了重大的牺牲与贡献。Shandong Province3. Return to the main document and find that the text box style has been successfully set to "Fine Effect-Olive Color, Emphasize Color 3".