Arsenoardennite
砷铝钡矿, 砷锰硅铝矿
🗣️ 情景例句
have become good friends, haven't you?
成了好朋友，不是吗？
How long will it take you to repair it?
你要多久才能修好它？
But we do not need to send men down to get the oil out, as we must with other mineral deposits.
但是，我们不必像开采其他矿藏那样，把人送到地下去把石油取出。