Перевод leonardo da vinci was the first man to make a scientific study of bird flight. "a bird is an instrument", he observed, "working to mathematical laws. he discovered many of these laws. he learned how birds balanced themselves, soared in spirals to gain height, flew with and against the wind. he was the first man to understand the main principles of flight control. he realized that a bird's wing compresses air beneath it, which gives it lift.
