名词
中文翻译：停止的圆盘
同义词：
['stopper', 'stopper disc', 'stopper wheel']
例句：
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1. The car's engine is a stop disc that needs to be replaced regularly.
汽车的发动机是一个需要定期更换的止动圆盘。
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2. The machine has a stop disc that stops the rotation when it reaches a certain point.
这台机器有一个止动圆盘，当它达到某个点时会停止旋转。
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3. The stop disc is used to prevent the machine from moving forward when not in use.
止动圆盘用于在不使用时防止机器向前移动。