名词
中文翻译：外闸
同义词：
['outer wheel', 'outer brake disc']
例句：
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1.The outer brake disc is worn out and needs to be replaced.
外闸盘磨损严重，需要更换。
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2. The outer wheel of the car is damaged, which affects the braking performance.
汽车的外轮受损，影响了刹车性能。
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3. The outer wheel of the train is designed to provide better braking efficiency.
火车的外轮设计用于提供更好的刹车效率。