英语语法分析

Without a strong and stable subgrade there is no stable pavement.

没有坚固、稳定的路基就没有稳固的路面。

Commercial golf courses utilize a subgrade of combined layers of gravel and sand.

商业高尔夫球场，利用一对组合层路基碎石和沙子。

The strength and stability of subgrade is the basic conditions to ensure the stability of road.

路基的强度和稳定性是保证路面稳定的基本条件。