It contains an million tons of magnesium, 1,000,000 tons, which is more than has ever been produced in one year by all the magnesium plants in the world.

它含有一百万吨镁，一百万吨，那比我们每年世界各地,生产镁的工厂的总产量还要多。

麻省理工公开课 - 固态化学导论课程节选

Aluminum is 25 million tons per year for the whole planet.

铝的产量为每年2500万吨,全世界。

麻省理工公开课 - 固态化学导论课程节选

Iron or steel, 800 million tons, almost a billion tons of steel.

铁或钢，每年8亿吨，几乎接近10亿的钢产量。

麻省理工公开课 - 固态化学导论课程节选