dilationn.扩张；扩大部分=dilatation.dilation of the culture文化扩张性Dilation of nasopharynx鼻咽扩张术Dilation and stretching扩张和拉长术Dilation of vesical neck膀胱颈扩张术Dilation of bladder neck膀胱颈扩张术dilation and contraction动脉扩张和收缩Dilation of parotid duct腮腺管扩张术Dilation of lacrimal duct泪管扩张术Dilation of salivary duct唾液管扩张术Dilation of sphenoid ostia蝶骨口扩张术