名词
中文翻译：保持环
同义词：
['holding ring', 'retaining ring', 'retaining collar']
例句：
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1. The engineer used a retaining ring to hold the bolt in place.
工程师使用一个保持环将螺栓固定在位。
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2.The retaining ring prevented the pipe from moving.
保持环阻止了管道移动。
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3. The retaining ring was designed to prevent the bolt from loosening over time.
保持环的设计是为了防止螺栓随着时间的推移而松动。