I want to be a mining engineer, so I ought to study petrology and engineer.

我想要当个采矿工程师，所以我应当研读岩石学及工程学。

youdao

I want to be a mining engineer, so I ought to study petrology and engineer.

我想要当个采矿工程师，所以我应当研读岩石学及工程学。

youdao