在扩大灌溉面积的同时，研究和推广了以节水为中心的灌溉新技术。

The practices of efficient use of water were studied and popularized at the same period.

youdao

在扩大灌溉面积的同时，研究和推广了以节水为中心的灌溉新技术。

The practices of efficient use of water were studied and popularized at the same period.

youdao