名词
中文翻译：看守人
同义词：
['guardian', 'supervisor', 'overseer']
例句：
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1.The custos was responsible for the security of the building.
看守员负责大楼的安全。
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2. The custos made sure that all visitors were properly registered.
看守员确保所有访客都进行了适当的登记。
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3.The custos had to make sure that the building was secure at all times.
看守员必须确保大楼任何时候都是安全的。