动词短语
中文翻译：倒流
同义词：
['backflow', 'counterflow', 'upstream']
例句：
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1.The river is back flowing due to theheavy rain.
由于大雨，河水正在逆流而上。
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2. The boat was struggling against the backflow of the current.
船正努力逆着水流前进。
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3. The project will require a lotof back pouring to get it offthe ground.
这个项目需要大量的逆流工作才能启动。