在接下来的几个世纪里，在整个罗马帝国以及在中东和北欧边界以外的地方建造了越来越复杂的水力发电厂。

In the following centuries, increasingly sophisticated waterpower mills were built throughout the Roman Empire and beyond its boundaries in the Middle East and northern Europe.

youdao

最后，他们终于以势如破竹之威，冲破罗马帝国北部边界的防线。

Finally they thundered through the Roman defenses along the northern boundaries of the empire.

youdao

它因是整个罗马帝国的边界而广为人知，而且也代表著那个世界最伟大的文明之一——古罗马——的荣誉。

It is the best known frontier in the entire Roman Empire and stands as a reminder of the past glories of one of the world's greatest civilisations.

youdao

There were always battles and wars going on, on the boundaries, the frontiers of the Roman Empire, but within the center of the empire there was an amazing period of peace.

战争永远都在进行，在边界，罗马帝国边境，但在帝国中心却是一派和平盛世。

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