两家公司计划先建造用于地面试验的原型机，并在2020年之前点火测试，随后在2025年以前完成原型机试飞。
The companies plan to have a ground-based demonstrator engine prototyped and firing by 2020 and a further prototype flying on a test aircraft by 2025.
中国隐形战斗机原型机进行了首次试飞。
China has carried out its first test flight of a prototype stealth fighter jet.
目前这还只是一架原型机，不过瑞士的一名飞行员架着它完成了一次试飞。测试人员称，飞机起飞十分平稳。
It's only a prototype right now but a man in Switzerland took it for a test flight and the take-off, they say was, pretty smooth.
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