名词
中文翻译：Unknown
同义词：
['downward flow', 'downward infiltration', 'downward seepage']
例句：
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1. The rainwater downwelled from the roof and trickled into the garden.
雨水从屋顶向下流，滴入花园。
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2.The groundwater downwells through cracks in the earth's surface.
地下水通过地表的裂缝向下渗透。
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3.The oil downwells from the reservoir and flows to the production well.
油从储油层向下流到生产井。