P2勉强称得上是测试原型并取得了成功，但是并没有成为更为人知的R系列家族的真正初始型号。

The P2 was a test prototype of sorts, and proved successful, but it never became the true series-starter for the more familiar R-series line.

youdao

这架飞机既可能是技术验证机，也可能是量产型号的原型机。

The aircraft may be a technology demonstrator or a prototype for a mass production fighter aircraft.

youdao