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1782年，两个法国人，约瑟夫和埃蒂安那·蒙哥费埃用纸和布料制作了一个气球。
In 1782 two Frenchmen, Joseph and Etienne Montgolfier, made a balloon out of paper and cloth.
youdao
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1782年，两个法国人，约瑟夫和埃蒂安那·蒙哥费埃用纸和布料制作了一个气球。
In 1782 two Frenchmen, Joseph and Etienne Montgolfier, made a balloon out of paper and cloth.
youdao