名词
中文翻译：暗土
同义词：
['darkearth', 'dark loam']
例句：
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1. The dark soil is rich innutrients that plants need to grow.
深色土壤富含植物生长所需的养分。
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2. Farmers often use dark soilto improve the quality of theircrops.
农民经常使用深色土壤来提高作物的质量。
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3. Dark soil is difficult tocultivate and requires more water than lighter soil.
深色土壤难以耕种，需要比浅色土壤更多的水。