"My means of ascsion and descension consist only in dilating or compressing the gas inclosed in the balloon."
“我使气球升降的方法,是使气球里的气体膨胀和收。
"My means of ascsion and descension consist only in dilating or compressing the gas inclosed in the balloon."
“我使气球升降的方法,是使气球里的气体膨胀和收。
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