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。
2
Be responsible for maintenance and management of petrol, engineoil 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。
3
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.