- emergency button
- 备用: reserve; spare; alternate; b ...
- 按钮: push-button; press-button; b ...
- 备用按钮开关: emergency push button switch; emergency pushbutton switch
- 闭塞用按钮: block push button
- 可用按钮: available button
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备用按钮的英文
发音:
- emergency button
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