• 1. prototype test flight: 原型试飞
• 2. prototype flight test: 原型机试飞

• 1.Future phases of the program will include the development of a real-time prototype collaborative navigation system and a flight test demonstration.
  该项目的未来阶段将包括研发一个实时协同导航系统样机并进行飞行测试演示。
  dict.yoduao.com
• 2.A prototype solar-powered plane has made its first full test flight - coming closer to the goal of using solar energy to fly around the world.
  一架以太阳能为能源的飞机已经圆满完成其首次试飞任务——其结果越来越接近我们利用太阳能环球飞行的目标。
  dict.yoduao.com
• 3.A Ho 2-29 prototype made a successful test flight just before Christmas 1944.
  就在1944年圣诞节前Ho 2 - 29原型完成了一次成功试飞。
  dict.yoduao.com

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