n.

1. 呼吸[U]
   I tried to gauge the depth of her sleep by the rate of her respiration.

   我试图通过她的呼吸速率来测定她的睡眠深度。

2. 一次呼吸[C]
3. 【生】呼吸（作用）

n.

1. the action of breathing.
   ▸a single breath.
2. Biology  the processes in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide, from the oxidation of organic substances.