• 戈尔菲耶兄弟俩最初的实验是把装进纸袋

    The montgolfier brothers began experimenting by filling small paper bags with smoke.

    youdao

  • 戈尔菲耶兄弟俩最初的实验是把装进纸袋

    The montgolfier brothers began experimenting by filling small paper bags with smoke.

    youdao

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