Since high oxygen levels are needed for most microbial life, and since microbial fossils are billions of years old, this odd state of discordant harmony has been quite persistent and stable.

• 既然绝大多数的微生物生命都需要高浓度的氧，既然微生物化石都已存在亿万年[5]，那么，这种奇特的不和谐的和谐状态就一直是相当持久而稳定的了。