名词
中文翻译：土壤
同义词：
['mud', 'soil', 'organic matter']
例句：
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1. The soil is rich in nutrients that plants need to grow.
土壤富含植物生长所需的养分。
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2. The farmer used organic fertilizers to improve the soil quality.
农民使用有机肥料来提高土壤质量。
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3. The humus layer plays a vital role in maintaining soil structure and water retention.
腐殖层在保持土壤结构和保水方面起着重要作用。