A so-called Earth Departure stage and Altair lunar lander would sit atop the core stage and be launched into orbit to meet Orion spacecraft carrying moon-bound astronauts.

所谓的地球分离级和牵牛星月球着陆器在核心级之上，被发射进入轨道后，与载有登月宇航员的猎户座太空船会合。

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Just as with Apollo, any modern venture would need some kind of CSM element for the astronauts, together with a departure stage - a propulsion unit that could accelerate the astronauts' vehicle out of low-Earth orbit, putting it on a path to the Moon.

BBC: Manned flight around Moon considered