• 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多年法国昂诺内寒冷夜晚蒙戈尔费埃兄弟卷缩在一堆篝火前面,他们对为什么上升到空中感到纳闷

    youdao

  • 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多年法国昂诺内寒冷夜晚蒙戈尔费埃兄弟卷缩在一堆篝火前面,他们对为什么上升到空中感到纳闷

    youdao

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