名词
中文翻译：自由按钮
同义词：
['free button', 'free switch', 'free switch button']
例句：
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1. The new car has a free push-button for starting the engine.
这款新车有一个可以启动引擎的无限制按钮。
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2. The remote control has a free push-button to turn on the TV.
遥控器有一个可以打开电视的无限制按钮。
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3. The door has a free push-button to open it.
门有一个可以打开的无限制按钮。