原材料引用(Materials)
It said people should increase the number of chest presses from fifteen to thirty for every two breaths given.
Gordon Ewy is a heart doctor at the University of Arizona College of Medicine in Tucson.
He wrote a report that appeared with the study.
信息与事实(Facts)
ir 发音时由第一个音i向卷舌音r滑动
er 先发前元音e，同时舌尖轻触下齿，然后很快滑向r音
感受与评价(Comments)
无
累计练习小时数(Hours)
0.5h
