US coal miners are gearing up to boost exports as the Iran crisis rattles energy markets, but soaring production and transport costs are complicating their ability to ship more tonnes.
随着伊朗危机扰动能源市场，美国煤矿企业正准备增加出口，但生产和运输成本飙升，正使它们更难运出更多煤炭。
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