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。

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