自从这座大厦发生了一起抢劫案之后，守夜人就更加小心了，他每小时都要巡视一次。
Since a robbery happened in this building, the night watchman has become more careful and makes his rounds once every hour.
自从这座大厦发生了一起抢劫案之后，守夜人就更加小心了，他每小时都要巡视一次。
Since a robbery happened in this building, the night watchman has become more careful and makes his rounds once every hour.
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