单词：surface soil
surface soil的用法和样例：
例句
- Surface should be treated as a key technology for conservation tillage.表土耕作应该作为保护性耕作的一项关键技术。
- 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。
- topsoil表层土
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