名词短语
中文翻译：Unknown
同义词：
['gravity irrigation', 'gravity-fed irrigation', 'gravity-driven irrigation']
例句：
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1. The farmers used to rely on gravity irrigation for their crops.
农民过去依靠重力灌溉来种植他们的庄稼。
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2.Gravity irrigation is an effective way to conserve water in dry regions.
重力灌溉是一种在干旱地区节约用水的有效方法。
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3. The new irrigation system uses gravity to distribute water evenly across the field.
新的灌溉系统使用重力将水均匀地分配到田地上。