动词短语
中文翻译：底部倒流
同义词：
['bottom runoff', 'bottom outflow例句：1. The rainwater is flowing down the drain at the bottom of the house.（雨水正顺着房子底部的排水沟流下。）']
例句：
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1. The rainwater is flowing down the drain at the bottom of the house.
雨水正顺着房子底部的排水沟流下。
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2.The river bottom pouring with sediment is a sign of environmental degradation.
河流底部沉积物堆积是环境退化的迹象。
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3. The farmers used to pump water from the bottom of the well to save on energy costs.
农民过去会从井底抽水以节省能源成本。