n.航空；飞机制造业

1. He devoted all his life to China's aviation.
他的一生都奉献给了中国的航空事业。
2. At that time aviation was still in its infancy.
当时航空仍在萌芽阶段。
3. Jets are a new development in aviation.
喷气式飞机是航空事业上的一个新成就。
4. In old China,there was hardly any machine- building industry,to say nothing of automobile and aviation industries.
旧中国几乎没有机器制造业，更不用说汽车制造业和飞机制造业了。