通常，需要选择可以根据需要委托到其他实体以组成完整结构的实体。
In general, you want to pick an entity that can delegate to the other entities as needed to compose the entire structure.
在内部，一个Python变量就是一个有许多成员组成的完整结构-即使当对象只代表一个整数时也是如此。
A Python variable is, internally, a complete structure, with lots of members — even when the object only represents an integer.
他从机械表的构造中学到了管理企业的关键：完整的结构组成，合理的配合，要有动力。
The structure of a mechanical watch has taught him keys to running a business: completeness in structural components, close cooperation between different parts, and strong motivation.
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