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。
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。
Right click with your mouse and Make Selection .
右键单击您的鼠标在作出选择。
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