申请中，赛尔登描述了一项机器是石油驱动、在驾驶座前有燃烧式发动机；离合器、脚刹车、前轮驱动。

In his application Selden described a machine with a gasoline-driven, combustion-type engine that sat in front of the driver; a clutch; a foot brake; a drive shaft; and front-wheel drive.

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发动机是用一种新的石油产品还是用氢气来驱动？

Will the motor be powered by a new kind of petroleum product or by hydrogen?

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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。

The quality specification for sulphur contents in petroleum products is an important item related to engine corrosion and environmental emission.

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