a clock watcher的用法和样例：
- In his last post he was known as a clock watcher . If he comes that game here, he'll lose his job.
- A clock and two vases stood on the mantelpiece.
- Excuse me. This is a clock I buy in your store three day ago.
- The silence was succeeded by the striking of a clock.
- If you work in a factory, you usually have to punch a clock.