But early flights, NASA said, "showed that the X-3 was severely underpowered and difficult to control."

但早期飞行，美国宇航局表示，“表明，在X - 3是严重动力不足，难以控制。”

youdao

But early flights, NASA said, "showed that the X-3 was severely underpowered and difficult to control."

但早期飞行，美国宇航局表示，“表明，在X - 3是严重动力不足，难以控制。”

youdao