All concrete commands — all business logic — realize the command interface.
所有的具体指令——所有的业务逻辑——实现命令接口。
Before you begin, however, you need to define the base Command interface.
然而在您开始以前，您需要定义基础Command接口。
Before you begin, however, you need to define the base Command interface.
然而在您开始以前，您需要定义基础Command接口。
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