For task commands, an empty command result is set before invoking the execute method.

对于任务命令，在调用execute方法之前设置空的命令结果。

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This is a empty program, it won't do anything. The next step is to add additional commands to the program, as described in one of the following tutorials.

这是一个空的程序，他什么都做不了。在以后的教程里，我们会陆续为他添加功能。

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