We couldn't survive without it - and in this episode, Naked Science reveals the scientific marvel of the Earth's unique and complex atmosphere. A precariously thin but vital blanket of air, see how a chance interplanetary collision and a remarkable plant mutation created the only planet in the solar system with an atmosphere rich in oxygen - the potent gas that powers our plane...$科普 温故而知新$Cool~$聞名一跳；其餘很普通
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