名词
中文翻译：守望者
同义词：
['watchman', 'sentinel']
例句：
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1. The old man was a keeper of the castle gates in the old days.
那个老人以前是城堡大门的看门人。
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2. The watchman patrolled the streets at night to keep an eye on the suspicious activities.
夜班警察巡逻街道，监视可疑活动。
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3. The sentinel stood guard by the bridge, ready to alert anyone who might approach.
哨兵站在桥上警戒，随时准备警告接近的人。