英语翻译

题目

英语翻译
之前的没发出.
The Romans bound their empire together with an extensive system of roads from Rome.Some of these early roads were of elaborate construction.First a trench was excavated to such a depth that the finished surface would be at ground level.The pavement was placed in three courses; a layer of small broken stones,a layer of small stones mixed with mortar and firmly tamped into place,and a wearing course of massive stone blocks,set and bedded in mortar.Some of the Roman roads are still in existence today.And many modern highways follow the ancient Roman routes.

答案

罗马人用通往罗马的发达的道路系统将他们的帝国紧紧地联结起来.这些早期建设的道路中有些是精心修筑的.首先挖一条深到使得将来完工的路面与地面相平的大深沟.公路共铺设三层,一层碎石子,接着是一层混合着灰泥并夯实的小石子混凝层,最后在其上铺上一层耐磨的大型石块.罗马时代的一些道路现在依然存在.而且许多现代公路依然沿循着古罗马的路线.