一旦您有了合适的位置，就可以释放鼠标的左按钮。

Once you have the correct placement, release the left mouse button.

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如果捕捉模式被切换为点模式，这时鼠标左按钮将仅仅拾取当前光标位置。

If the snap is set to Point, then the left mouse button will simply pick the current cursor position.

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要在目录和检索结果间切换，只需单击左窗格下方的按钮即可。

To move between the contents and search results, click the buttons at the bottom of the left pane.

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We clicked adult at top left this time and now this.

这次我们点击了左上边的按钮。

哈佛公开课 - 计算机科学课程节选