Digital Data Network ( DDN ) is a data transmisston network using digital channels.数字数据网 ( DDN ) 是采用数字信道来传输数据信号的数据传输网.Driect line 、 ISDN 、 DDN 、 Frame relay 、 ADSL 、 Broadband 、 Hunting line. 、 E 1、 PRI and so on.如:直线电话、...
我用螺丝刀拧那些该死的螺丝钉时一点也使不上劲儿。I couldn't get any purchase with the screwdriver on the damn screws.他用螺丝刀戳她的脸颊。He gouged her cheek with a screwdriver.这把电钻也可用作螺丝刀.The electric drill can also be used as a screwdriver....