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 300,000 people in the United States every year.

有些時候，音標和讀音還有點對不上，看到音標發(fā)錯音，還是練習的太少。

事情再多，也可以一件一件做完，不能放棄，也應(yīng)該好好安排，讓自己做的更有效率。

累積練習半小時