英语翻译之前的没发出.The Romans bound their empire together with an ex
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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.
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.
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.
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