名词
中文翻译：清洁工
同义词：
['cleaner', 'maid', 'caretaker']
例句：
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1.The janitor was cleaning the windows when I arrived.
我到的时候，清洁工正在擦窗户。
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2. The janitor had to clean the entire school building before the big event.
在大型活动之前，清洁工得清理整个学校大楼。
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3.The janitor was very helpful and friendly, always willing to assist us with our work.
这个清洁工非常乐于助人，总是乐意帮助我们工作。