希腊世界的关键是其强大的船队，而罗马帝国的关键则是它的步兵团。

The key to the Greek world lay in its high-powered ships; the key to Roman power lay in its marching legions.

youdao

罗马世界具有一种凝聚力，这种凝聚力既不适用于希腊，也不适用于其他古今文明。

There is a quality of cohesiveness about the Roman world that applied neither to Greece nor perhaps to any other civilization, ancient or modern.

youdao

然而，这种情况也有其黑暗的一面：尽管我们取得了进步，世界上仍有一半的人口在受苦，供水服务还不如古希腊和古罗马人。

Yet there is a dark side to this picture: despite our progress, half of the world's population still suffers, with water services inferior to those available to the ancient Greeks and Romans.

youdao