就在1944年圣诞节前Ho 2 - 29原型完成了一次成功试飞。
A Ho 2-29 prototype made a successful test flight just before Christmas 1944.
俄国的苏霍伊t - 50隐形战机原型去年刚进行了首次试飞，预计将在4年后服役。
Russia's Sukhoi T-50 prototype stealth fighter made its maiden flight last year and is due to enter service in about four years.
在不远处的开发实验室，马特·班尼特(Matt Bennett)向我展示了另一架飞机原型，这架飞机早已成功试飞过。
In a nearby development lab, Matt Bennett showed me another of the prototypes which have already flown successfully.
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