名词
中文翻译：Unknown
同义词：
['elevator', 'escalator']
例句：
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1. The arm elevator is a safety feature in the elevator.
扶手电梯是电梯的一个安全特性。
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2. The escalator was designed to make it easier for people to move up and down the stairs.
自动扶梯的设计是为了使人们更容易上下楼梯。
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3. The elevator operator must be trained to handle emergencies.
电梯操作员必须接受紧急情况处理的培训。