什么是CPR？ 就是心肺复苏，什么？还不知道，那你赶紧看看下文吧
The American Heart Association changed its guidelines for CPR chest presses in 2005. It said people should increase the number of chest presses from 15 to 30 for every two breaths given. Gordon Ewy is a heart doctor at the University of Arizona College of Medicine in Tucson. He wrote …