名词
中文翻译：环形管
同义词：
['annular ring', 'annular member', 'annular sleeve']
例句：
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1. The annular tube is used to connect two pieces of equipment together.
环形管用于将两件设备连接在一起。
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2. The annular tube was designed to reduce vibrations in the system.
环形管的设计旨在减少系统中的振动。
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3. The annular tube was used as a support for the heavy machine.
环形管被用作重型机器的支撑。