渗水土路基的英文怎么说
渗水土路基的英文：permeable soil subgrade
permeable是什么意思：
a. 有浸透性的,能透过的
[*]This membrane is semi-permeable.
这层膜是半渗透性的。[*]The waste material is placed in cells with permeable membranes
废液置于有渗透膜的槽中。[*]The major difference is that geological structures have limited permeability.
主要的问题是地质结构的渗透性有限。soil是什么意思：
n. 土地，土壤；国土，领土
v.（被）弄脏
[*]He died on British soil.
他死于英国。[*]The soil is difficult to work with.
这块污迹很难处理。[*]The fertilization of soil is a subject to the farmers.
肥料的施用对农民来说是一门学问。subgrade是什么意思：
地基; 路基
[*]Road bed is the subgrade on which are laid the ballast, ties and rails.
路基就是上面铺着道渣，枕轨和钢轨的底基。
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