The fifth objective, was astronaut training, mainly a useful byproduct of the program.

计划的第五个目标是训练宇航员，这主要还是一个有用的附带结果。

youdao

The fifth objective, was astronaut training, mainly a useful byproduct of the program.

计划的第五个目标是训练宇航员，这主要还是一个有用的附带结果。

youdao