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。”
2
The quality specification for sulphur contents in petroleum products is an important item related to engine corrosion and environmental emission.
石油产品的硫含量质量指标，是与发动机的腐蚀及环保排放有关的重要项目。
3
They directed their own auto industry to drop hybrid engine research because they realize petroleum will be exhausted in 20 years and to find alternatives.