Some raw materials, such as iron ore, come from mines.

有些本材料，如铁矿等，是从矿山里开采出来的。

youdao

As we know raw materials are also changed into some other kind of product.

我们知道原材料也要变成某些种类产品。

youdao

As we know raw materials are also changed into some other kind of product.

我们知道原材料也要变成某些种类产品。

youdao