Activating a selection (by double-clicking with the mouse, or pressing the spacebar) causes the corresponding item to be opened in the editor.
激活某一个选择(通过双击鼠标，或按下空格键)会让对应的项目在编辑器中打开。
For discontinuous selections make a selection with the mouse, press Ctrl (Cmd on Mac) and make additional selections to copy or print just what you want.may.
对不连续选择，通过鼠标来选择，并按住Ctrl (Mac电脑用cmd)键来选择其它要复制或打印的你所需要的任意部分。
Use the mouse for editing and selection.
用鼠标进行编辑和选择。
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