You can take several approaches when implementing a scripting system.
在实现一个脚本系统时，你可以使用几种方法。
When implementing this method, you can build up dest from src any way you want.
实现此方法时，您可以按任意方式从src构建dest。
When implementing this interface, raise this event before changing the current item.
在实现此接口时，会在更改当前项之前引发此事件。
When implementing this interface, raise this event after the current item has been changed.
在实现此接口时，会在更改当前项之后引发此事件。
When implementing this interface, raise this event after the current item has been changed.
在实现此接口时，会在更改当前项之后引发此事件。
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