人们都知道莱特兄弟发明了第一架飞机,但对另一位航空事业的先驱——兰利却知之甚少。兰利是美国物理学家、天文学家。他成功制造了第一架重于空气的飞机。并对飞行理论进行了深入研究。为了纪念这位航空先驱,美国发行了一枚面值45美分的邮票,邮票的画面就是兰利和他的飞机(如右图)。 People know that the Wright Brothers invented the first plane, but little is known about Langley, another pioneer in aviation. Langley is an American physicist and astronomer. He succeeded in making the first aircraft heavier than air. And conducted in-depth study of flight theory. In honor of the aviation pioneer, the United States issued a stamp of 45 cents worth of face value, the picture of which is Langley and his plane (pictured to the right).