For each accounting entity a self-contained, double-entry accounting system is employed.
每一个会计单位都运用独立的、复式记账的会计体系。
The self.__last instance attribute (which is a private attribute because it starts with a double underscore) holds the previous mouse click position.
__last实例特性(它是一个私有特性,因为它以双下划线开头)包含上一次鼠标单击位置。
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