名词
中文翻译：免提按钮
同义词：
['ring-to-talk button', 'ring-to-talk switch']
例句：
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1. The car's ring-off button is located on the steering wheel.
汽车的免提按钮位于方向盘上。
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2. The customer service representative quickly dialed the ring-off button to connect with the manager.
客户服务代表迅速按下免提按钮，以与经理通话。
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3. When the call was answered, the operator pressed the ring-off button to end the call.
当电话接通时，操作员按下免提按钮结束通话。