B is for Breathing: Look, Listen and Feel for signs of normal breathing: LOOK for normal chest movements, LISTEN for normal breathing sounds and try to FEEL their breath against your face.

B代表呼吸，寻找，聆听和感觉正常呼吸的迹象：寻找正常的胸部动静，聆听正常的呼吸声音，并尝试感觉病者对着你脸上的呼吸。