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。

youdao

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。

youdao