被臭氧层形成
Formed by the ozone layer
以上为机器翻译结果,长、整句建议使用 人工翻译 。
一旦光合作用上升了大气氧气成水平足够高,臭氧层被形成,意味,它是然后可能为生存事冒险土地。
Once photosynthesis had raised atmospheric oxygen levels high enough, the ozone layer formed, meaning that it was then possible for living things to venture onto the land.
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