Chapter two: definition of class and classroom management, its function and types.
第二章对课堂和课堂管理的概念、功能和类型进行论述。
Complex moments, divided into many types, is moment function which takes complex as its core.
复数矩是以复数为核的矩函数，它有许多不同的类型。
Use this function if you are creating custom error types.
如果要创建自定义错误类型，请使用此函数。
Use this function if you are creating custom error types.
如果要创建自定义错误类型，请使用此函数。
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