英语翻译

英语翻译
few people know that Sir George Cayley(1773--1857)has been called the inventor of the airplane,although I prefer to think of him as its grandfather.
Cayley made wide anatomical studies of birds and bird flight.From the studies ,Cayley was sure that it was impossible for humans to tie a pair of wings and be taken to the air.This led him to plan a fixed-wing airplane with a divided system for push .He developed three gliders that embodied these ideas.The gliders were successful in carrying people over a shortdistance --the first successful modern airplane design.His work was highly important helpful to the final development of the airplane.
In 1903,the Wright brother and their flying machine brought their achievement to the world sight,in a way that truly marked beginning of a new time.