或者至少这是诺斯罗普-格罗曼提出双鹰计划后的设想。

Or at least that's the concept behind Northrop Grumman's proposed Double Eagle mission.

youdao

或者至少这是诺斯罗普-格罗曼提出双鹰计划后的设想。

Or at least that's the concept behind Northrop Grumman's proposed Double Eagle mission.

youdao