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1·Rudolf diesel is the German inventor of the diesel engine.

鲁道夫柴油是发明柴油发动机的德国发明家。

2·Dr. Rudolf Diesel believed his engine would operate on a variety of vegetable oils but, as petroleum-based diesel fuel was cheaper and readily6 available, it quickly became the fuel of choice.

鲁道夫·狄塞尔相信他的发动机可以用各种各样的植物油驱动，但由于以石油为基础的柴油燃料价格更便宜且容易获取，于是柴油迅速成为发动机燃料的首选。