喀斯特山区、沙漠边缘及黄土高原是我国的生态环境脆弱带。

Karst Area, the margin of desert and loess altiplano are eco-environmental frail zones in China.

youdao

喀斯特山区、沙漠边缘及黄土高原是我国的生态环境脆弱带。

Karst Area, the margin of desert and loess altiplano are eco-environmental frail zones in China.

youdao