What is fire anyway?

火究竟是什么？

Well, fire is rapid oxidization. It's the energy released when oxygen atoms start combining with carbon and hydrogen atoms.

火，即燃烧，是快速的氧化反应d7d!*-ehsipI@G。氧化反应是氧原子和碳原子或氢原子结合释放能量ZgCw,.Pi=Rr9l9[wE。

Exactly, so without oxygen in the air, nothing burns.

没错，那么如果空气中没有氧气，就不会有燃烧X2MYRBe~YyPtq。

You mean there was a time before oxygen?

你是说氧气还不存在的那个时代？

By roughly a billion years ago, simple forms of plant life called "eukaryotes" were already busily converting carbon dioxide into oxygen gas, just like their descendants do today.

大约十亿年前，和眼下的植物一样，地球上最原始的植物祖先“真核细胞”忙碌地将二氧化碳转变成氧气o+u(]*XIj@MjEPRjbc。

译文为可可英语翻译，未经授权请勿转载!