名词
中文翻译：逆流
同义词：
['backflow', 'countercurrent', 'countercurrentflow', 'counter-current flow']
例句：
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1. The water in the riverhas a counterflow that helps to cleanthe city's sewage system.
河流中的水有逆流，有助于清洁城市的污水系统。
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2. Inthe chemical industry, counterflow is used to separate impurities from the main stream ofchemicals.
在化学工业中，逆流被用来将杂质从主要化学品的流中分离出来。
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3. The counterflow ofthe river creates a natural barrier against floods.
河流的逆流创造了一个自然障碍，防止洪水。