The Montgolfier brothers began experimenting by filling small paper bags with smoke.
尔菲耶兄弟俩最初的实验是把烟装进小纸袋。
The Montgolfier brothers began experimenting by filling small paper bags with smoke.
尔菲耶兄弟俩最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
是成功的，而且，正如约瑟夫菲尔设想，气球成为有用的用于
的。
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