Following the fueltesting the aircraft is undergoing structural coupling and ground vibration testing, as well as completing hydraulic testing of the doors and landing gear.
此次燃料测试后，飞机将进行结构耦合和地面振动测试，并将完成门和起落架的水压测试。
2
Bigger engines running hotter may deliver greater fuel efficiency, but they are also testing the limits of modern materials.
运行温度更高的较大引擎可能带来更好的燃油利用率，但它们同时也测验着现代材料的极限。
3
A new study says that within three years jumbo jet-makers could be testing a new type of wing that reduces midair drag and cuts fuel costs by an estimated 20 percent.