日常的发明改变了世刻界。切斯特·格林伍德有一件烦心事:一到冬天,他住的地方就十分寒冷,他常常觉得耳朵冰凉。其他孩子都把羊毛围巾裹在头上。可是,羊毛使他很痒。在一个大冷天里,他想到了一个主意。他把一根铁丝扭成两个环形,又让祖母在环上缝了毛皮。然后,他在两个环形之间连了一根弹簧,将这副新的耳套固定在了头上。 The everyday invention has changed the world. Chester Greenwood has a bothering thing: in the winter, where he lives is very cold, he often felt ears cold. Other children wrapped woolen scarves in their heads. However, the wool makes it very itchy. In a big cold day, he thought of an idea. He twisted a wire into two rings, and let the grandmother sew fur on the ring. He then attached a spring between the two rings, securing the new earmuffs to his head.