Dropka德罗普考dropvt.落下；跌倒；下降；放弃；漏掉；断绝关系n.滴；微量；减少；滴状物drop door chain底门链drop feed oiler滴给加油器drop passengers让乘客下车drop-out rate辍学率drop-priority公平性drop valve gear坠阀装置dropping height适宜的下落高度drops formation雾化dropsy of brain[医] 脑积水dropping baffle跌水挡板