守夜人

例句：

1. 1. The old man was a night watchman for the town.
   那位老人是这个镇的守夜人。
2. 2. He was a sentinel at the gate of the castle.
   他在城堡门口担任哨兵。
3. 3. The night watchman kept a vigil by the window all night.
   守夜人在窗户旁整晚站岗。