However, a two-stroke engine USES more gasoline and burns lots of oil, so it is far more polluting.

二冲程发动机使用更多的汽油，燃烧更多的燃料，所以产生更多的污染。

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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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Compositions and features of the base oil used in producing FB two-stroke engine oil were briefly described.

介绍了FB二冲程油基础油的组成和特性，进行了添加剂的筛选和配方研制。

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