translation.en: And the doctor has her sit down, and he takes her peak expiratory flow rate -- which is essentially her exhalation rate, or the amount of air that she can breathe out in one breath.
translation.zh: 医生请她坐下， 给她测了呼气流量率峰值-- 实际上是她的呼气率， 或者说是她一口气所呼出的空气量