以下为句子列表:
英文: Experimental attempts may have begun by 1709, but not until 1783 did J.-M. and J.-é. Montgolfier develop a fabric-bag balloon that would rise when filled with hot air.
中文: 1709年人类开始作实验性的尝试,但一直至1783年法国蒙戈尔费埃兄弟才发展出一种纤维织物袋气球,其在充满热空气后即可浮升。
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