矿产资源勘查、开发和利用水平是反映人类社会进步的重要标志。

The mineral resources exploration, prospecting and capacity level is an important symbol of human social progress.

youdao

矿产资源勘查、开发和利用水平是反映人类社会进步的重要标志。

The mineral resources exploration, prospecting and capacity level is an important symbol of human social progress.

youdao