4000年以前,人类把一种浅绿色的石头烧熔后倒进泥土做的模子里,烧制出一种能装上木柄刺杀野兽和敌人的武器,并在龟甲上刻下了它的名字——矛。当时人们做梦也不会想到,几千年以后——古老的矛伸向空中三维空间在扩展 1903年12月17日,在美国东南部北卡罗来纳州的海滩上,被后人称为“航空飞行之父”的莱特兄弟启动第一架飞机在空中飞行了 4000 years ago, a man burnt a light green stone and poured it into the soil to make a mold that could be armed with a wooden handle to kill beasts and enemies, and tortoiseshell engraved its name - -spear. At that time, people never dreamed of it. Thousands of years later, the ancient spear stretched into the air three-dimensional space. On December 17, 1903, on the beach in North Carolina, southeastern United States, it was later described as " The Wright brothers started the first flight in the air