top soil

常见例句

• If the topsoil is taken away by erosion, plants can no longer grow in the soil left behind.
  如果因水土流失而冲掉了表土，植物不能再在留下的土壤中生长。
• The runoff sediment has higher clay content than the surface soil, andthe splash soil has higher fine sand content.
  通过对侵蚀上壤的颗粒组成分析表明，侵蚀对土壤颗粒具有选择性，径流侵蚀泥沙中粘粒含量比侵蚀表土含量高，溅蚀泥沙中细沙粒含量变高。
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