droptv.放下；掉下vbl.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 dazedly倒毙drop a glass弄掉杯子, 摔掉杯子drop-countn.磁带漏码总数dropped seat凹椅座dropped sole凸状足底drop machine落锤试验机drop manhole跌水窨井drop in head水头落差drop in beam挂梁dropped punt瓶底下沉