oxygen it

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3.

There was obviously oxygen in the world, but it was bound oxygen, it wasn't free oxygen .

当时显然有氧，但那是结合氧，不是自由氧。

www.englishtide.com

4.

If there is too little , this artery narrows , starving baby's brain of the oxygen it needs to develop properly.

如果雌激素太少，动脉收缩，胎儿大脑会因供氧量不足而发育不全。

www.ebigear.com

6.

About one-fifth of air is oxygen . It helps burning.

空气中约有五分之一的气体是氧气。

7.