这是1893年的一张照片,奥特·李林塔尔乘着他的载人飞行器翱翔在人群上空。
Otto Lilienthal soars above a crowd in one of his manned gliders in an 1893 photograph.
气动力(被动)不稳定对于载人飞行器是不利的。
Aerodynamic (passive) instability is a disadvantage for manned vehicles.
然后载人飞行器和着陆器将连接到一起,并飞向月球。
The crew vehicle and the lander will then link up and fly off to the moon.
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