1.16

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