第二次发作很严重，他的气道肿胀，无法呼吸，血压突然下降，心脏停了一会儿。
The second attack was so serious that his airway swelled, preventing him from breathing, his blood pressure dropped suddenly, and his heart stopped for a moment.
当新的刺激出现时，心脏和呼吸监测仪为研究者提供其心跳或呼吸的次数。
Heart and respiration monitors provide the investigator with the number of heartbeats or breaths taken when a new stimulus is presented.
最常见的严重突发事件包括心脏病、中风和呼吸困难。
The most common of the serious emergencies include heart trouble, strokes, and difficulty breathing.
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