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问题: 请翻译一句话,which引导的从句我分析不出来

For example, oil from which we make gasoline has substitutes but none that are currently very close(imagine a steam-driven, coal-fueled car)

解答:

例如,我们用来制取天然气的石油是有替代品,但是现在没有一种(替代品)跟它比较接近(想下一个蒸汽推动,以煤为燃料的汽车)