road building短语⁷⁹⁹⁷⁸⁺⁹ 基本例句 道路建筑 交通 Natural road building materials have a close relation to the engineering quality and cost, and the changing of geologic conditions may cause some design modifications. 天然筑路材料与工程质量及造价有着密切关系，变更设计中有些是由于地质条件的变化而引起的。 cnki This rock can be ground up and used for road building. 这台机器能粉碎石头，可用来筑路。 iciba