名词
中文翻译：热水循环
同义词：
['heat exchange', 'heat transfer', 'hot water circulation']
例句：
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1. The hot-water circulation system is designed to improve the efficiency of heating.
热水循环系统旨在提高加热效率。
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2.In this experiment, we observed the hot-water circulation process.
在这个实验中，我们观察了热水循环过程。
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3.The hot-water circulation system helps to maintain a comfortable temperature in the room.
热水循环系统有助于保持房间内舒适的温度。