An "undo" feature can be added to this framework relatively easily. An undo operation can be added to ICommand and implemented in each ConcreteCommand.
“undo”特性能被相对容易地添加到这个框架中，undo操作可以被添加到ICommand，并且在每个ConcreteCommand中实现。
An "undo" feature can be added to this framework relatively easily. An undo operation can be added to ICommand and implemented in each ConcreteCommand.
“undo”特性能被相对容易地添加到这个框架中，undo操作可以被添加到ICommand，并且在每个ConcreteCommand中实现。
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