1、
2、
The Montgolfier brothers began experimenting by filling small paper bags with smoke.
蒙戈尔菲耶兄弟俩最初的实验是把烟装进小纸袋.
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3、
Montgolfier brothers had successfully made the world's first hot air balloon.
蒙氏两兄弟成功制造出世界上第一个热气球.
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