脚踏板和键盘开关替代了鼠标按键。
A foot-pedal or keyboard switch then replaces the click of a mouse button.
选择源输入字段,但不按住鼠标按键。
Select the source input field without holding down the mouse button.
悬停在源输入字段上,单击显示的拖动手柄,但不要按住鼠标按键。
Hover over the source input field, single-click the drag handle that appears but do not hold down the mouse button.
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