【正文】
s in a terrible accident on the ground. but we39。此資料由網(wǎng)絡(luò)收集而來,如有侵權(quán)請(qǐng)告知上傳者立即刪除。資料共分享,我們負(fù)責(zé)傳遞知識(shí)。ve never lost an astronaut in flight. we39。ve forgotten the courage it took for the crew of the shuttle. but they, the challenger seven, were aware of the dangers, but ove