-
Groundwater is not only the valuable natural resources, but also the basic element of environment.
地下水是一种宝贵的自然资源,同时又是环境的基本要素。
youdao
-
Groundwater is not only the valuable natural resources, but also the basic element of environment.
地下水是一种宝贵的自然资源,同时又是环境的基本要素。
youdao