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★☆☆ isdn ○○○○○

1.N-UNCOUNT 不可数名词综合业务数字网 ISDN is a telephone network that can send voice and computer messages. ISDN is an abbreviation for (缩略＝) 'Integrated Service Digital Network'.

【搭配模式】：oft N n

...an ISDN phone line.一条 ISDN 电话线

noun abbreviation for

Integrated Services Digital Network: a system for sending voice, video and information over telephone wires very quickly 整合式服务数位网路，“一线通”

isdn - Image

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