洼地

yǔ shuǐ jī zài jǐ chù wā dì li

雨水积在几处洼地里。

The rain collected in several depressions.

tián píng wā dì

填平洼地

fill up a depression

wā dì gǎi zào

洼地改造

improvement of low-lying land

gāi qū yù wā dì hěn duō

该区域洼地很多。

Much of the region is lowland.

zhè piàn wā dì bèi shuǐ yān le

这片洼地被水淹了。

Vast areas of low-lying land have been flooded.