分类：教育/科学-外语学习
问题：翻译下面两段话（与土木工程有关）Agoodsub
    A good sub-base, sh as compacted aggregate material or fully compacted native soil (if structurally suitable) provides structural support of the path. If a path is constructed over a poor sub-grade, excavation to remove wet, organic or otherwise unsuitable material, treatm    A good sub-base, sh as compacted aggregate material or fully compacted native soil (if structurally suitable) provides structural support of the path. If a path is constructed over a poor sub-grade, excavation to remove wet, organic or otherwise unsuitable material, treatment with soil-cement or application of a geotextile fabric may be required.    Remove all organic material, including roots, when preparing the sub-grade. The application of a soil sterilant or lime at the sub-grade level may be required to control the growth of new vegetation. Paths built in wooded areas typically require special attention. Roots of trees and shrubs can pierce the surface of the path or cause it to heave and break apart. Preventive methods include removal of vegetation and realignment of the path away from trees.
回答：一个好的底基层，比如压实的砾石材料或者完全压实的当地泥土（假如构造合适的话）能够给道路提供构造支持。如果要在一个不好的地基上建造道路，可能要通过挖掘来去除潮湿、有机或其他不合适的物质，也可能要用水泥与土混合料或者地质纺织面料进行处理。在准备地基时要去除全部有机物质，包括树根草根。在地基层可能有必要使用泥土不育剂（植物绝育剂）或石灰以控制新的植物生长。在林木生长的地区建造道路尤其需要特别注意。大树和灌木的树根能穿破道路的表面或者造成路面隆起、破裂。 预防方法包括去除植物和将道路重组离开树木。