Think about space travel.Make a list of what we have and haven't done.急阿 随便列两条就行 不用多起码3条吧..

问题描述:

Think about space travel.Make a list of what we have and haven't done.
急阿 随便列两条就行 不用多
起码3条吧..

爱莫能助

like :we haven't find any Extra-Terrestrial(E.T.)
and now we can go to moon