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人群哄地一声，都喜笑颜开，都道没事了。Composite Reuse Principle (CRP) is to use some existing objects in a new object to make it part of the new object. New objects reuse used functions by delegating to these objects. In short, it is necessary to use synthesis/aggregation as much as possible and not inheritance as much as possible.Rosmarinus officinalis动物的很多行为总是令人难以置信，但是你有想过他们为什么会这样吗？来自唐顿庄园的休·博内威利将带您了解这些自然界最匪夷所思的问题。例如，萤火虫在黑暗中如何会发光？大象能用脚听声音？电鳗会发电，但为什么电不到自己？为什么狗要摇尾巴？为什么企鹅的脚不会被冻坏？从广阔的非洲大草原到亚马逊热带雨林深处，本系列节目将带您走遍世界，了解令人赞叹的动物行为。通过最新的科学发现独特的实验，我们将了解动物们千奇百怪的癖好和习性。了解动物王国的内部运作，揭示令人难以置信的秘密。In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:我早就给你预留好了角色。