Chemical modification including oxygenation, esterify, graft copolymerization and so on.
化学改性主要有氧化、交联、酯化和接。
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Take the Great Oxygenation Event of 2.3 billion years ago: evidence from ancient rocks tells us that levels of atmospheric oxygen spiked around this time, poisoning the oxygen-hating microbes that had dominated Earth for well over a billion years.
看看 23 亿年前的大氧化事件:古代岩石纪录显示,大气层中氧气含量在此时飙高,毒死了厌氧的微生物,它们已称霸地球超过十亿年。