dropinn.磁带杂音信息(落入)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 out detector漏码检测器drop out of sight从视线内消失dropping velocity沉降速度droping frequency下降频率drop-out margin下降边际drop-in winding落入式绕组dropping the ball掷公正球drop-leaf table可以折叠边缘的桌子drop sb. a hint暗示一下某人, 对某人作点启发dropped our guardv.丧失警惕