a watch tower的用法和样例：
- I went to a watch tower in the city and oversawthe view of the city.
- So placing a few silos and maybe a watch tower behind it can be troublesome for those harassers to get to your harvesters.
- The police put a watch on the suspect's house.
- He sneaked a watch into his pocket.
- He stands on the watch tower seeing the troops off.
- He is cleaning the room when he finds a watch in the corner.
a watch tower的相关资料：
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