a taste in the mouth的用法和样例：
- Black coffee leaves a bitter taste in the mouth.
- Don't look a gift horse in the mouth.
- She looked a bit down in the mouth.
- The patients may develop a metallic taste in the mouth and loose bowel actions.
- There was a taste of almond in the cake.
- A taste persisting in the mouth after the substance that caused it is no longer present.