名词
中文翻译：逆流
同义词：
['counterflow', 'reverse flow']
例句：
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1.The river has a counterflow that helps to dilute the pollutants in the water.
这条河流有一个逆流，有助于稀释水中的污染物。
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2. The engineer designed a system to counteract the effects of gravity on the liquid.
工程师设计了一个系统来抵消重力对液体的影响。
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3. The scientist observed that the contraflow could be used to improve the efficiency of the process.
科学家观察到，逆流可以用来提高过程的效率。