他们建造了许多桥梁和引水渠，而且其中有一些至今仍被使用。

They built a lot of bridge and the diversion channel, but some of them still use.

大坝、引水渠和其他基础设施仍然需要修建，尤其是在人类基本需求尚未得到满足的发展中国家。

Dams, aqueducts and other kinds of infrastructure will still have to be built, particularly in developing countries where basic human needs have not been met.

随着城镇的逐渐扩大，水资源要从越来越远的地方获得，这就需要建造如水坝和引水渠这样复杂的工程。

As towns gradually expanded, water was brought from increasingly remote sources, leading to sophisticated engineering efforts such as dams and aqueducts.