名词
中文翻译：限制环
同义词：
['boundary ring', 'boundary ring', 'limit circle']
例句：
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1. Theteam decided to limit the number of players on the field.
团队决定限制场上球员的数量。
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2. The scientist used a limit ring to measure the thickness of the material.
科学家使用一个限制环来测量材料的厚度。
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3.The car was fitted with a limit ring to prevent it from rolling over.
汽车安装了限制环以防止它翻滚。