Open their airway as before and check for normal breathing again.
像先前一样打开气道，并再次检查是否有正常呼吸。
Move seven feet away, and you're "close to background, " i.e., breathing normal air.
站到七尺以外的话，你已经非常接近背景水平，也就是说呼吸到正常的空气。
Breathing rate increases to 50% above normal level. Prolonged exposure can cause headache, tiredness.
呼吸频率增加到正常水平以上50%。持续暴露会导致头痛、疲劳。
Breathing rate increases to 50% above normal level.
呼吸频率增加到正常水平以上50%。
Breathing rate increases to 50% above normal level.
呼吸频率增加到正常水平以上50%。
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