浏览整个文件夹直到找到你要的坐标系统，再单击它。

Navigate through the folders until you find the coordinate system you want, then click it.

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另外，假如我想分离它，我只需要单击并拖动，然后就可以回到过去那个状态，再继续把不同的拼图放到一起。

And if I want to detach it, I just click and drag, and now I can go back and put different puzzle pieces there altogether.

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