注意，这比只打印出hello world句子而没有用户交互的典型HelloWorld应用程序稍高级一些，但消息被输出到了调试窗口。

Note that this is a little more advanced than a typical HelloWorld application that prints the statement without user interaction, but the message is printed to debug.

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因为自定义标签的这种行为在某些情况下只适用于高级用户。

Just remember that editing the preferred tabs is the behavior of a somewhat advanced user.

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