名词
中文翻译：电梯返回按钮
同义词：
['elevator button', 'return button', 'elevator touchpad']
例句：
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1. Theelevator returns to the lobby every 15 minutes.
电梯每15分钟返回大堂。
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2. The elevator returned with a group of tourists.
电梯载着一群游客回来了。
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3. The elevator stopped at the top floor and the passengers had to wait for the next one.
电梯停在顶层，乘客不得不等待下一班。