在20世纪之前,人类早就想像鸟一样在天空飞翔,并有不少的先行者和富有见地的研究者,如德国的奥托·李林达尔。他一生中进行过上千次成功的无动力滑翔试验,为后人开辟了前进的道路。但在20世纪最初的几年里,有许多技术问题还未能解决,人类飞上天空看起来还遥不可及。 Before the 20th century, humans had long been like birds flying in the sky, and there are many forerunners and insightful researchers, such as Germany’s Otto Lydarin. He conducted thousands of successful unpowered gliding tests throughout his life, opening up a path for future generations. However, during the first few years of the 20th century, many technical problems were still unsolved and it seemed out of reach for humans to fly to the sky.