名词
中文翻译：Unknown
同义词：
['undercurrent', 'underflow']
例句：
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1. The undertow iscausing the boat to veer offcourse.
底层水流导致船偏离航线。
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2. Thefish swim in the undertow,which is constantly changing.
鱼在底层水流中游动，这不断变化。
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3. The undertow can be a dangerous force,especially when it's strong.
底层水流可能是危险的，特别是当它很强时。