实施或者扩展固定类或者界面。

Implements or extends from nested classes or interfaces.

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只允许固定数量实体的类。

A class that only allows a fixed number of instances ofitself.

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在清单2中，我重新打开了numeric类(其处理固定和浮点数字)以便添加gram和pound方法。

In Listing 2, I reopen the Numeric class (which handles both fixed and floating-point Numbers) to add the gram and pound methods.

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