The Montgolfier brothers began experimenting by filling small paper bags with smoke.
蒙戈尔菲耶兄弟俩最验是把烟装进小纸袋。
The Montgolfier brothers began experimenting by filling small paper bags with smoke.
蒙戈尔菲耶兄弟俩最验是把烟装进小纸袋。
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