nightwatchman

noun

1. 守夜人
   a man whose job is to guard a building such as a factory at night

1. 夜间警卫员;值夜者;守夜者
   A nightwatchman is a person whose job is to guard buildings at night.

1. Living in history means living in a world of constant threat where there is no nightwatchman to keep the peace among nations, so nations must keep the peace themselves by maintaining a balance of power.
   生活在历史中意味着生活在一个威胁不断的世界里&在这个世界里，没有守夜人保持各国之间的和平，因此各国必须自己通过保持实力均衡来维护和平。
2. He was found by the nightwatchman.
   他是被守夜人发现的。