波澜壮阔的２０世纪即将过去，更为灿烂的２１世纪将要到来。回顾过去，２０世纪是新技术革命的世纪，新能源、新材料、电子信息、生物工程、航空航天等高新技术方兴未艾，充满了创新的活力。尤其是航天技术的开发利用使人类进入了第四活动领域，是２０世纪人类取得的伟大的成 The magnificent 20th century is about to pass, the more splendid 21st century will come. Recalling the past, the 20th century is the century of new technological revolution. New and high technologies such as new energy, new materials, electronic information, bioengineering and aerospace are in the ascendant and are full of vitality for innovation. In particular, the development and utilization of aerospace technology has brought mankind into the fourth field of activity and is a great achievement made by humans in the 20th century