We breathe air all the time.
If we stop breathing, we will die.我们不停地呼吸。如果我们停止吸气,那我们就会死。
They came out of the tunnel and thankfully breathed the fresh air.
She breathed a sigh of relief.
As all animals and plants breathe air, we can be quite sure there is no life on the moon.
动植物都要呼吸空气,所以我们完全可以断言月球上没有生命。