它最初是设计为3马赫高空轰炸机，但后来为研究飞机使用。

It was originally designed as a Mach 3 high-altitude bomber, but was later used as a research aircraft.

youdao

美国情报官员确信这架飞机是被一枚乌克兰发射的S-200，又名为SA-5导弹意外击落的，这是一种被用来击落高空重型轰炸机的大型地对空导弹。

U. S. intelligence officials believe the plane was accidentally hit by a Ukrainian S-200, or SA-5, missile - a large surface-to-air missile built to shoot down heavy bombers flying at high altitudes.

youdao

美国情报官员确信这架飞机是被一枚乌克兰发射的S-200，又名为SA-5导弹意外击落的，这是一种被用来击落高空重型轰炸机的大型地对空导弹。

U. S. intelligence officials believe the plane was accidentally hit by a Ukrainian S-200, or SA-5, missile - a large surface-to-air missile built to shoot down heavy bombers flying at high altitudes.

youdao