美国国家航空及太空总署说，此前曾出现过四次轨道内的意外碰撞，但都是火箭部件和其他碎片。

NASA said there have been four earlier instances of accidental collisions in orbit, generally involving rocket parts and other debris.

youdao

美国国家航空及太空总署说，此前曾出现过四次轨道内的意外碰撞，但都是火箭部件和其他碎片。

NASA said there have been four earlier instances of accidental collisions in orbit, generally involving rocket parts and other debris.

youdao