名词中文翻译
中文翻译：回流
同义词：
['return flow', 'counterflow例句：1. The river back flows into the sea.（这条河往回流入大海。）']
例句：
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1. The river back flows into the sea.
这条河往回流入大海。
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2.The machine has a built-in back flow valve to prevent leaks.
这台机器内置了一个防漏的反向流动阀门。
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3.The back flow of the water was causing problems with the drain.
水流的逆向流动导致了排水系统的故障。