Recycling second-hand aircraft carrier, overhaul nuclear reactor, unpick and wash missile engine oil, clean aircraft carrier, space shuttle, maintenance, such change.

回收二手航母，大修核反应堆，拆洗和洗导弹发动机油，清洁的航空母舰，航天飞机，维修，这样的变化。

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Opponents reckon they have colluded in making up optimistic projections about the speed with which airlines will change to yet-to-be-built clean, quiet aircraft.

对于改用清洁、安静的飞机后可以对航空公司产生的变化，反对者们声称已经做出了最乐观的预测，尽管这飞机还没有研发出来。

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Aviation mechanics who specialize in the power plant of an aircraft know how to dismantle, inspect, clean, overhaul, and rebuild various types of flight engines.

专攻于飞机动力装置的航空技师懂的如何拆卸，检查，清洁和重新组装各类飞机引擎。

youdao

Opponents reckon they have colluded in making up optimistic projections about the speed with which airlines will change to yet-to-be-built clean, quiet aircraft.

ECONOMIST: Business travel

For China to truly transition to a service economy and produce products high up the value chain with real innovation--as the government has made a priority in fields like aircraft, and clean technologies--it must have the business minds that can lead the way there.

FORBES

The groups are Friends of the Earth, the Aviation Environment Federation, the National Society for Clean Air, and the Heathrow Association for the Control of Aircraft Noise.

BBC: Pollution warning on holiday flights