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1. The chemical industry uses a lot of sulphur in its production processes.
化学工业在其生产过程中大量使用硫磺。
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2. Sulfur is a natural element that occurs in the earth's crust.
硫是一种自然元素,存在于地球的地壳中。
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3. The burning of fossil fuels releases large amounts of sulfur dioxide intothe atmosphere.
化石燃料的燃烧释放出大量的二氧化硫进入大气。