a sour note的用法和样例：
- The meeting ended on a sour note with several people walking out.
- Use of the draft as a form of punishment has struck a sour note in some quarters.
- The writer knows not to insert an obscure word in a particularly quiet and sensitive passage, lest it sound like a sour note in a string quartet.
- strike middle C; also used metaphorically: strike a sour note.
- This milk has gone sour; it has a sour taste.
a sour note的相关资料：