You see he mentioned smelting.

你看他提到了熔炼。

You are a normal smelting workers What?

你是个普通的冶炼工人么？

When he said smelting, I said, OK, you got it.

当他说熔炼，我会说，好，你明白了。

How much copper can your smelting factory smelt in a day?

你们这个冶炼厂一天能够熔冶出多少铜来？

Chromite is main raw material for smelting ferrochromium.

铬铁矿是生产铬铁合金的重要原料。