v.旋开盖子；取下（螺丝）
The lid of this jam pot won't unscrew. 这果酱罐的盖子拧不开。
The officer unscrewed the cap and put the bottle to his nostrils. 那位官员拧开了瓶盖，把瓶子凑近鼻孔。
You'll have to unscrew the handles to paint the door. 要漆这扇门,你得把门把手上的螺丝拧开拿下来才行。
v.没有扭紧
没有扭紧
拧下
