Iran is one of the world's largest crude-oil producers, but has an inadequate refining capacity that forces it to import useful petroleum products.
伊朗是世界主要原油生产国之一，但缺乏提炼设施，迫使伊朗进口汽油和其他成品油。
They refine crude oil into various petroleum products.
他们将原油提炼成各种石油产品。
They refined crude oil into various petroleum products.
他们将原油提炼成各种石油产品。
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