test flightn.(飞机的)试飞；
例如Reaction to the test flight was mixed.
The engine cracked on the first test flight.
在首次试飞时，发动机发生裂纹。
Test Flight Technology of Airplane Propulsive System in Prospect
飞机推进系统飞行试验技术的发展
The test flight was to discover the bugs in the new plane.
试验飞行是要发现新飞机有何缺陷。
