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1. The newcar uses a straight-run motor fuelthat is environmentally friendly.
这款新车使用的是一种直列式发动机燃料，对环境友好。
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2. The mechanic replaced the old enginewith a new one, which required astraight-run motor fuel.
机械师用一种直列式发动机燃料替换了旧的引擎。
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3. The company has invested inresearch to develop a more efficient straight-run motor fuel.
该公司投资研究开发了一种更高效的直列式发动机燃料。