Sand is the primary substance used in the construction of roads, bridges, high-speed trains and even land regeneration projects.

沙子是用于建设道路、桥梁、高速列车甚至土地再生项目的主要物质。

It has been effective in eradicating physical and technological obstacles: physical, through the construction of roads, power plants and bridges; technical, by facilitating (through means fair and foul) the transfer of foreign intellectual property.

这在摧毁自然规律和技术障碍很有效果，通过建设道路，能源计划和桥梁；技术使得转移国外的知识产权变得便利（通过直接的和肮脏的方法）。

It wasn't until 2004 that they found the cause of the problem was lime or calcium hydroxide, to give it its proper chemical name, which was being used in the construction of roads.

直到2004年，他们终于找到了这个问题的根源是石灰，或者叫一个专有化学名词，氢氧化钙，是一直被用来建设公路的物质。