求翻译： 大部分钼精矿来自美国，品位高（Mo58%以上），含杂低，用于生产优质的钼酸铵，这些优质的钼酸铵用做钼催化剂；是什么意思？

 Most of molybdenum from the United States, high grade (Mo58% or more), low impurity, for the production of high-quality ammonium molybdate, ammonium molybdate used these high-quality molybdenum catalyst;

* Most  molybdenum concentrates grade high (Mo came from the United States, more than 58 per cent) and low impurity content that is used in the production of high quality molybdenum acid ammonium molybdate, these high quality of ammonium used as molybdenum catalysts;

 The majority of molybdenum ore concentrate comes from US, the personal status high (above Mo58%), including mixed low, uses in producing the high quality ammonium molybdate, these high quality ammonium molybdates with make the molybdenum catalyst;

Most of the molybdenum concentrate from the United States, high grade (Mo58%), low impurity to produce high quality ammonium molybdate, these high quality ammonium molybdate as catalysts;

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