"My means of ascsion and descension consist only in dilating or compressing the gas inclosed in the balloon."
“我使气球降
方法,是使气球里
气
和收缩。
"My means of ascsion and descension consist only in dilating or compressing the gas inclosed in the balloon."
“我使气球降
方法,是使气球里
气
和收缩。
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