The incidences of valve failure were 3.35%/patient-year for bovine valves, 1.52%/patient-year for porcine valves and 2.2%/patientyear for dura mater valves.是什么意思_The incidences of valve failure were 3.35%/patient-year for bovine valves, 1.52%/patient-year for porcine valves and 2.2%/patientyear for dura mater valves.在线翻译_英语_读音_用法_例句