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.
有些时候，音标和读音还有点对不上，看到音标发错音，还是练习的太少。
事情再多，也可以一件一件做完，不能放弃，也应该好好安排，让自己做的更有效率。
累积练习半小时
