英语语法分析

Under well-oxygenated conditions, microbes produce N2O at low rates.

氧气充足的条件下，微生物生成一氧化二氮的速率很低。

This is probably because a fetus starved of oxygen will send oxygenated blood to the brain in preference to rest of the body.

这可能是因为一个缺乏氧的胚胎会首先把充氧的血液输送到脑部，然后才送到身体的其他部位。

If that is the case, the species was able to adapt from anoxic, or oxygen depleted, environments to an era of oxygenated oceans.

如果这个理论成立，意味着这种细菌能够适应从缺氧到含氧的海洋环境。