he says this would save lives.
studies show that many people do not want to perform mouth-to-mouth breathing on a stranger for fear of getting a disease
Cardiac arrest kills more than 300000 people in the united states every year
perform
carry out .work.
ɔɪ先发ɔ音发i音。
ʊə先发u音，再慢慢滑向ə
ɒ嘴巴张大，舌身后缩，双唇收圆，短元音。
感受:感觉还是要有复盘才能深刻，要不会忘了。
练习小时数一小时
