一次航天飞行讲座(A Lctur on Spac Flight)一次航天飞行讲座(a lctur on spac flight)last saturday i attndd a lctur on spac flight. i am glad that i hav larnd a lot about spac.now i know somthing about th structur of a spac rockt and undrstand th importanc of spac flight to mankind.i bcom intrstd in spac.ystrday i borrowd svral books on spac from th school library. i want to b a spac scintist in th futur.