名词
中文翻译：Unknown
同义词：
['gravity flow', 'gravity-driven flow', 'gravity-induced flow']
例句：
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1. The gravity-flow system is designed to collect rainwater for irrigation.
重力流系统设计用来收集雨水用于灌溉。
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2. The gravity-flow system is crucial for maintaining the water quality in the river.
重力流系统对于保持河流水质至关重要。
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3. The gravity-flow system was developed to reduce the amount of wastewater discharged into the ocean.
重力流系统被开发出来以减少排放到海洋的废水量。