Since cardiopulmonary resuscitation (CPR) guidelines was constituted in 1974, it was adopted many times.
Since cardiopulmonary resuscitation (CPR) guidelines was constituted in 1974, it was adopted many times.
摘要心肺复苏指南自1974年制定以来，多次修订改进。
Since cardiopulmonary resuscitation (CPR) guidelines was constituted in 1974, it was adopted many times.
摘要心肺复苏指南自1974年制定以来，多次修订改进。