It said people should increase the number of chest? presses from 15 to 30 for every two breaths given Gordon Ewy isa heart doctor at the University of Arizona college of medicine in Tucson. He wrote a report that appeared with the study.

有些名字 地名，包括專有名詞，真的不知道怎么讀，還不知道什么意思，真的是要靠積累的，不是能猜一下的，知道就知道了，不知道就是不知道。

現(xiàn)在有些適應(yīng)美音了，之前聽著不舒服

累積練習(xí)半小時