You have to mix oil into the gas in a two-stroke engine because the holes in the cylinder wall prevent the use of rings to seal the combustion chamber.

在二冲程发动机中你必须混和燃料和气体，因为气缸壁上的孔阻止使用活塞环密封燃烧室。

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Be responsible for maintenance and management of petrol, engine oil and natural gas equipment.

负责汽油、机油、天然气等辅助设施的使用与维护管理。

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Such tasks include opening and closing the garage door, starting the engine, and stopping at traffic lights, in addition to putting oil and gas in the car and performing periodic maintenance.

这些任务包括打开和关闭车门、开动引擎、在红绿灯面前停车，为车加油及进行定期的养护。

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The continent's primary industrial engine imports 60% of its gas and oil needs.

WSJ: South Africa Faces Power Shortage Despite Gas Reserves

Relying on oil and gas wealth, the country has yielded only a handful of entrepreneurial successes: search engine Yandex, e-mail service Mail.ru, cyber security giant Kaspersky Labs, and cloud computing company Parallels.

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