路基的英文：
bed
roadbed
subgrade

参考例句：

Sub-grader;sub-base grader
路基整平机

Coarse gravel or crushed rock laid to form a bed for roads or railroads.
道碴用来铺公路或铁路路基的粗砂砾或碎石。

A foundation of crushed rock or a similar substance for a road or railroad.
路基碎石或类似物质做的道路或铁路的基础。

construction of roadway
路基土石方施工

The earthquake made the roadbed cave in.
地震后路基沉陷了 。

The earthquake made the roadbed cave in
地震后路基沉陷了。

scrooge later became Tiny Tim's benefactor
斯克路基后来成了蒂尼?蒂姆的保护人。

The steamroller leveled out the gravel roadbed and than the concrete was poured.
蒸汽辗压机先把路基的沙砾辗平，然后才倒下水泥。

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。

Erosion of a relatively soft surface,such as a roadbed,by a sudden gush of water,as from a downpour or floods.
冲刷相对松软表面的冲刷，如路基被源于暴雨或洪水的水流冲刷

bed是什么意思：
n. 床，睡眠处；睡觉；（海、河、湖等的）底部；苗床
v. 把...安置在；为…提供住宿（床位）；睡，卧

Procrustean bed
逼人就范之物

Bed rest is more like bed agony.
上床睡觉好象是种苦恼。

It has bedded into the deepest crevices of the store.
它已钻进了店里最隐避的隙缝。

roadbed是什么意思：
n. 路基

The earthquake made the roadbed cave in.
地震后路基沉陷了 。

To cover or surface(a roadbed, for example) with broken stones.
用碎石来铺设（如公路）的表面。

The steamroller leveled out the gravel roadbed and then the concrete was poured.
蒸汽压路机把石子路床压平;然后注上水泥。

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。