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有任何疑问或需要帮助，请通过邮件或社交平台联系我们。您的反馈是我们改进的重要动力。Fast forward — way forward. The 1st inkling humans had in the existence of oxygen as an element was in 1608, when Dutch inventor Cornelius Drebbel documented which the heating of saltpeter (potassium nitrate) produced a gas,