使用电脑鼠标或轨迹球鼠标有时候非常棘手。
Using a computer mouse or trackball can be a little .
（坐在我右手边的编辑正抱怨着他左手用着的轨迹球鼠标。）
( My right-handed editor swears by a trackball mouse in his left hand . )
轨迹球鼠标