1. It is bacteria that have generated the oxygen we breathe on earth.
    正是细菌生产出我们在地球上呼吸的氧气。

2. It is in the air that people breathe.
    人们呼吸的空气中有水。

3. For what, I sometimes wonder; so that she can struggle to breathe through most of her life feeling half her strength, and then die of self-poisoning, as her grandfather did?
    有时我纳闷：自己这样做到底是为了什么? 难道是为了她今后大半辈子有气无力地挣扎着呼吸，然后再像她外公那样自己把自己毒死？