名词
中文翻译：Unknown
同义词：
['spectator', 'observer', 'guardian', 'watchman', 'vigilant', 'keeper']
例句：
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1. The police officer was a strict watcher of the crowd.
那位警察是严格监督人群的。
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2. She is a keen watcher of her children's activities.
她非常关注她孩子们的活动。
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3. The watcher stood at the edge of the cliff, ready to jump in if necessary.
守望者站在悬崖的边缘，准备在必要时跳下去。