石油和天然气的代用品已有多种投入使用，至少已小有规模地使用。
Many alternatives to oil and gas are already in use, at least in a small way.
90年代发现二甲醚是可以替代柴油的超低污染燃料以及作为液化石油气的代用品；此外，它还可用于制备低碳烯烃。
In 1990s, it was found that the dimethyl ether as a super-low pollution fuel can be used to replace diesel oil and liquefied petroleum gas, in addition, it also can be used to prepare light olefin.
90年代发现二甲醚是可以替代柴油的超低污染燃料以及作为液化石油气的代用品；此外，它还可用于制备低碳烯烃。
In 1990s, it was found that the dimethyl ether as a super-low pollution fuel can be used to replace diesel oil and liquefied petroleum gas, in addition, it also can be used to prepare light olefin.
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