?? ???????????????????
????:1??????????:???????????
2???????
3??????
4????????
5?????????
???????????“?????”?????????????,?????????????????(NASA)?????????12?????????????????17???????,????3?????,NASA???,??????2???(SpaceX)?????“????????”????
?,NASA???????????????????????????????????2??,??????,???????????????SpaceX?,?3???
????,????,NASA?SpaceX???,???????
?????????,??6???????????????6?,????????“???”??????,????????6???????14??,????????????????????,??????8???,NASA??????????,?“???????????????????”????2????(SpaceX)?????????“???????????”???????????????????(? ?)
?????????????????:????????????