Doua杜瓦dov.做；干n.注意事项；<非正式>聚会；<古>事情Do you want a cup?do someone an ill turn做有损于某人的事,危害某人,使某人吃亏do more harm than good弊大于利Do not block the trail别阻塞道路Doyne's guttate iritisdosimetric measurement剂量测量doppler beat frequency多普勒拍频Doppler uhrasonography多谱勒超声do everything they can竭尽全力do favor to each other交相利