1. A self-propelled lighter-than-air craft with directional control surfaces. 
   飞艇，飞船自身驱动且比空气轻的飞行器，有方位控制平面
2. The constant noise of air craft flying overhead gets on everyone's nerves. 
   连续不断的习机轰鸣声老在头上响着，使得人人心烦意乱。
3. A pilot or navigator of a lighter-than-air craft, such as a balloon. 
   飞船驾驶员，气球驾驶员轻于空气的航空器，例如气球的驾驶员或导航员
4. a craft capable of moving over water or land on a cushion of air created by jet engines. 
   能过通过由喷气机制造的气垫在水中或陆地运动的船。
5. As the air craft moves forward, the air flowing over the wings produces lift to raise the aircraft off the ground, and keep it in the air. 
   当飞机向前移动时，机翼上方的气流产生向上的力使飞机飞离地面保持在空中不坠。

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• 1. 航空器
  air corridor 空中走廊...air craft 航空器...air craftsman 空军士兵
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