名词
中文翻译：观察者
同义词：
['observer', 'spy', 'intruder']
例句：
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1. The detective was a keen observer of human behavior.
侦探是一个敏锐的观察人类行为的人。
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2. The thief was caught by the police after a careful spying.
这名小偷被警方在仔细侦查后抓获。
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3. She was accused of being an intruder into her neighbor's home.
她被指控是闯入邻居家的人。