古时候，人类就向往像鸟一样翱翔在天际，俯瞰大地的雄姿，品味腾云驾雾的乐趣。人们曾设想了许多方法，做了种种尝试，甚至不惜牺牲宝贵的生命，但最终都失败了。直到１９世纪末，德国航空先驱奥托李林塔尔用自己制造的固定翼滑翔机试飞成功，揭开了人类飞翔的新篇章，被人门 In ancient times, humans longed for a bird-like hover in the sky, overlooking the majestic landscape of the earth and enjoying the pleasures of the clouds. People had conceived many methods, made various attempts, and even sacrificed precious lives, but eventually failed. Until the end of the 19th century, German aviation pioneer Otto Lilienthal made a successful test of his own fixed-wing gliders, which unveiled a new chapter in human flight.