More than200years ago the montgolfier brothers huddled before a fire on a chilly night in the french town of annonay and wondered why smoke went up in the air .
200多年前,在法国昂诺内镇的一个寒冷的夜晚,蒙戈尔费埃兄弟卷缩在一堆篝火前面,他们对烟为什么会上升到空中感到纳闷。
More than200years ago the montgolfier brothers huddled before a fire on a chilly night in the french town of annonay and wondered why smoke went up in the air .
200多年前,在法国昂诺内镇的一个寒冷的夜晚,蒙戈尔费埃兄弟卷缩在一堆篝火前面,他们对烟为什么会上升到空中感到纳闷。
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