a watch key的用法和样例：
- The police put a watch on the suspect's house.
- He sneaked a watch into his pocket.
- He is cleaning the room when he finds a watch in the corner.
- She wanted to raffle for a watch.
- He talks like a watch which tick away minute, but never strike the hour.
- Father gave me a watch for my birthday.
a watch key的相关资料：