1981年4月14日是“哥伦比亚”号航天飞机首次试飞预定返回地面的日子。这一天,数十万观众云集在莫哈维沙漠爱德华兹空军基地干湖床周围,等待着世界上第一架可重复使用的航天飞机的降落。“哥伦比亚”号航天飞机4月12日从佛罗里达州肯尼迪空间中心发射后,经过约54小时绕地球36圈的飞行之后,定于14日当地时间下午1点21分,降落在爱德华兹空军基地114平方公里湖床的一条8公里多长的坚硬跑道上。之所以选择这里做这次航天飞机试飞的 April 14, 1981 is the day when the first space shuttle Columbia was scheduled to return to the ground. On this day, hundreds of thousands of spectators gathered around the dry lake bed at Edwards AFB, Mohave, awaiting the landing of the world’s first reusable space shuttle. After about 54 hours of orbiting the earth after about 36 hours of launch on April 12, from the Kennedy Space Center in Florida, the U.S. space shuttle Columbia is scheduled to landed at Edwards Air Force Base at 1:21 pm on the 14th On an 8 km long, hard runway of a square kilometer lake bed. The reason why I chose to do this shuttle test flight