unscrew

动词 unscrew:

1. loosen something by unscrewing it
2. loosen by turning

1. 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。
2. The lid of this jam pot won't unscrew.
   这果酱罐的盖子拧不开。