因此我国从上世纪末开始进口三水铝石型铝土矿生产氧化铝，近几年来，利用进口三水铝石型铝土矿生产氧化铝的规模日益扩大。

Aluminum product using raw bauxite of bayerite was imported from overseas in our country from last century, and the scale of production was continually expanded in recent years.

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自2004年末以来，我国重特大煤矿安全事故频发，引起了社会各界对矿难的广泛关注。

Since the end of 2004, mining accidents with heavy casualties have occurred frequently, which drew great attention from all circles of the society.

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