top soil

常见例句

• If the topsoil is taken away by erosion, plants can no longer grow in the soil left behind.
  如果因水土流失而沖掉了表土，植物不能再在畱下的土壤中生長。
• The runoff sediment has higher clay content than the surface soil, andthe splash soil has higher fine sand content.
  通過對侵蝕上壤的顆粒組成分析表明，侵蝕對土壤顆粒具有選擇性，逕流侵蝕泥沙中粘粒含量比侵蝕表土含量高，濺蝕泥沙中細沙粒含量變高。
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