发动机工作过程中的“lean-burn”和 “rich-burn ”怎么翻译？

Lean burn refers to the burning of fuel with an excess of air in an internal combustion engine. In lean burn engines there can be 65 times as many air molecules as fuel molecules, yielding an air–fuel ratio of 65:1. The air–fuel ratio needed to stoichiometrically combust petrol, by contrast, is 14.64:1. The excess of air in a lean burn engine combusts more of the fuel and emits less hydrocarbons. High air–fuel ratios can also be used to reduce losses caused by other engine power management systems such as throttling losses.

http://en.wikipedia.org/wiki/Lean_burn

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