The Montgolfier brothers began experimenting by filling small paper bags with smoke.
蒙戈尔
耶兄弟俩最初的实验是
进小纸袋。
The Montgolfier brothers began experimenting by filling small paper bags with smoke.
蒙戈尔耶兄弟俩最初的实验是进小纸袋。
Nevertheless, the flight was a success, and, just as Joseph Montgolfier had envisioned, balloons became useful for military purposes.
然而，试验飞
是成功的，而且，正如约
尔设想，气球成为有用的用于军事目的。
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