If true is passed then the controller model is displayed, if false is passed then the controller model is hidden.

如果传入true，控制器模型就被显示出来，如果传入false，控制器就被隐藏了。

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If False, the file descriptor is kept after the file is closed.

如果是False，此文件描述符会在文件关闭后保留。

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If False, the file descriptor is kept after the file is closed.

如果是False，此文件描述符会在文件关闭后保留。

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