仅在三年前，中国还是煤炭净出口国。

Only three years ago China was a net coal exporter.

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丹麦是食品和能源的净出口国，有稳定的收支平衡。

Denmark is a net exporter of food and energy and has a comfortable balance of payments surplus.

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尽管伊朗是个石油净出口国，但它也是精炼石油产品的净进口国。

Although Iran is a net exporter of oil, it is a net importer of refined products.

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