名词
中文翻译：循环管
同义词：
['circulatory tube', 'circulatory system例句：1. The circulating tube is used to distribute the coolant throughout the engine.（循环管用于在整个发动机中分配冷却剂。）']
例句：
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1. The circulating tube is used to distribute the coolant throughout the engine.
循环管用于在整个发动机中分配冷却剂。
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2. The circulating tube was designed to improve the efficiency of the cooling system.
循环管的设计旨在提高冷却系统的效率。
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3. The circulating tube was a crucial component in the development of modern engines.
循环管是现代发动机发展中的关键组件。