Annual production of magnesium is about 600,000 tons per year.

每年的镁产量，大约是六十万吨。

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Its present production capacity is over 500 tons per year.

它目前的生产能力超过每年500吨。

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Its present production capacity is over 500 tons per year.

它目前的生产能力超过每年500吨。

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