driven geardriven pulleydriven wheeldrivenwheelengaged wheelfollow-up pulleyfollowerfollowing pulley从: follow动轮: driving wheel从动轮,从动件: follower从动轮 随动轮: followerwheel随动轮 从动滑轮 从动轮: follow-uppulley下载手机词典可随时随地查词查翻译