The first is that expensive oil and relentless competition among airlines have put greater pressure than ever on aircraft and jet-engine manufacturers to push the limits of technology.
其一是昂贵的油价和航空公司间残酷的竞争，在飞机和引擎制造商上施加比以往更大的压力，促使它们跨越技术障碍。
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。
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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