名词
中文翻译：Unknown
同义词：
['reaction', 'circulation', 'flow', 'circulation', 'circulation']
例句：
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1. The reactor is responsible for the chemical reactions taking place in the system.
反应器负责系统内发生的化学反应。
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2. The new design improves the circulation of air and gas throughout the building.
新设计改善了空气和气体在建筑物内的流通。
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3. The engineers were monitoring the circulation of water in the pipelines.
工程师们正在监测管道中水的流动情况。