名词
中文翻译：逆流
同义词：
['counterflow', 'countercurrent', 'reverse flow']
例句：
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1. Theriver has a strong current that can carry away boats.
这条河水流湍急，能将船只冲走。
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2. The scientist used a device to measure the flow of blood in the body.
科学家使用一种装置来测量身体内血液的流动情况。
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3.The water flows from the mountain to the valley in a reverse direction.
水从山上流向山谷，流向与自然相反的方向。