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.
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.
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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