Far below sea level, they contain some of the harshest environments on Earth, with no oxygen and no light.

VOA: special.2010.11.10

So, in this case, we see that our formal charge is negative on the nitrogen, in this case it's negative on oxygen.

那么，在这种情况下，我们看到氮的形式电荷是负的，而在这种情况下，氧的是负的。

麻省理工公开课 - 化学原理课程节选

So, we can say that -- if we have neon here and we want to think about what's isoelectronic, -- f minus would be isoelectronic. We also have oxygen -- what would the charge on oxygen be? Um-hmm, right. 2 minus.

那么，我们可以说--如果我们这里有氖原子,而我们想知道与它等电子的是什么，负一价的氟离子就是与它等电子的，我们还有氧-,氧应该是几价的？没错，负二价。

麻省理工公开课 - 化学原理课程节选

This makes it more difficult for the body to effectively use the same amount of oxygen as it would on the ground.

VOA: special.2009.07.14

And what can happen is that this cartoon shows that if you put a magnetic field on liquid oxygen, that liquid oxygen would be drawn towards the magnetic field.

能够发生的就是,在动画里有所体现,如果你把液氧放在磁场中，液氧会被吸起来,朝着磁场的方向。

麻省理工公开课 - 固态化学导论课程节选

Engineers had to boil off the remaining oxygen by turning on a heater in the tank.

VOA: special.2009.07.22

Because of the lack of oxygen getting to the cells, the cells are no longer able to carry on their various metabolic processes.

由于细胞中缺少氧气,所以细胞不能完成,它们的各种新陈代谢活动

耶鲁公开课 - 死亡课程节选

It carried oxygen,water, electricity and food for two men for two days on the moon's surface.

VOA: special.2009.07.22

He said the great machines that produced the atmosphere on the planet had stopped producing oxygen.

VOA: special.2010.07.31

Doctors say the damage brought on by these conditions eventually interrupts the natural exchange of oxygen and carbon dioxide in the lungs.

VOA: standard.2010.06.21