Observation of the changes of diameter and unobstructed rate of transplanted autogeneic graft of parallel bi-vein and uni-vein with valves by color doppler ultrasound是什么意思_Observation of the changes of diameter and unobstructed rate of transplanted autogeneic graft of parallel bi-vein and uni-vein with valves by color doppler ultrasound在线翻译_英语_读音_用法_例句