He adds: "in theory, you could have a plug-in hybrid with a renewable fuel powered [internal combustion engine] and eliminate the need for petroleum all together."
他还称：“理论上讲，你可以在使用可再生燃料的引擎上增加一个混合插件，这样可以彻底不使用汽油。”
Due to shortage of petroleum and enhancement of exhaust emissions standard, the substitute fuel engine has become more and more important.
随着石油的不断短缺及排放标准的提高，代用燃料发动机越来越受到重视。
The natural gas engine gains an advantage of the cheap fuel and low let over other engines, so it is utilized universally in the field of petroleum and natural gas.
天然气发动机相对于其他动力机组，有着排放低、燃料价格低廉的优势，在石油天然气中得到广泛的应用。
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