base course

• 基层

base course的用法和样例：

例句

1. Therefore, he laid a base course of crushed stone on top of a compact footing instead of the costly stone foundation.
   因此他就在压紧的路基上铺碎石基层，而不使用造价很高的石块路基。
2. The analytical results show that it is possible for the stabilized slaking mudstone to be used as base material.
   研究表明，泥岩泥化物纤维固化体具有较好的强度与抗变形特性，可作为巷道路面的基层材料。
3. Some of the mobilized elements may be reprecipitated at the base of the soil profile.
   某些移出的养分可能在土壤剖面底层重新沉淀下来。
4. Lithographic plate where the printing image area base is usually brass or copper, and the non-printing area is usually stainless steel or chromium.
   印纹部份常用黄铜或铜为底层，非印纹部份常用不绣钢或铬为面层的柯式印版。