Relative to the waste rock dump of underground mining, open-pit mining needs a larger one.

相对于地下开采的废石场，露天开采的排土场占地面积要大得多。

youdao

Relative to the waste rock dump of underground mining, open-pit mining needs a larger one.

相对于地下开采的废石场，露天开采的排土场占地面积要大得多。

youdao