The Montgolfier brothers began experimenting by filling small paper bags with smoke.
蒙戈尔菲耶兄
初的实验是把烟装进小纸袋。
The Montgolfier brothers began experimenting by filling small paper bags with smoke.
蒙戈尔菲耶兄初的实验是把烟装进小纸袋。
Nevertheless, the flight was a success, and, just as Joseph Montgolfier had envisioned, balloons became useful for military purposes.
然而，试验飞
是
功的，而且，正如约瑟夫菲尔设想，气球
有用的用于军事目的。
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