名词
中文翻译：环形的
同义词：
['annular ring', 'annular gear', 'annular casing']
例句：
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1. Theengine has an annular ring that helps it run smoothly.
发动机有一个环形圈，有助于它平稳运行。
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2. The annular gear is used to reduce friction between the two parts of the machine.
环形齿轮用于减少机器两部分之间的摩擦。
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3. The annular casing protects the inner components from damage during transportation.
环形外壳在运输过程中保护内部组件免受损坏。