You cannot be calm if you are hyperventilating, shallow breathing or holding your breath, so start by taking 5 deep belly breaths (in through your nose, out through your mouth).
如果你不能平静你上气不接下气呼吸急促或者屏息以待你可以做腹式呼吸5次(用鼻子吸气用嘴呼气)。
2
A doctor had removed a breathing tube and was holding a phone to his face.
医生拿掉了氧气管，把电话举到他面前。
3
And all over the hill there was a noise as if everyone had been holding their breath and had now begun breathing again, and then a murmur of talk.