电信专业英英词典D-7

　　DSU

　　data service unit

　　DTMF

　　dual¹ tone multiple frequency

　　DTS

　　digital termination service

　　Dual-Tone Multiple Frequency (DTMF)

　　the generic² name for the tone signaling scheme used to signal from telephones to switching equipment, in which 10 decimal digits³ and two auxiliary⁴ characters are represented by selecting two frequencies of the following group: 697, 770, 852, 941,1209,1336,1447 Hz.

1 dual   

adj.双的；二重的，二元的

参考例句：

• The people's Republic of China does not recognize dual nationality for any Chinese national.中华人民共和国不承认中国公民具有双重国籍。
• He has dual role as composer and conductor.他兼作曲家及指挥的双重身分。

2 generic   

adj.一般的，普通的，共有的

参考例句：

• I usually buy generic clothes instead of name brands.我通常买普通的衣服，不买名牌。
• The generic woman appears to have an extraordinary faculty for swallowing the individual.一般妇女在婚后似乎有特别突出的抑制个性的能力。

3 digits   

n.数字( digit的名词复数 )；手指，足趾

参考例句：

• The number 1000 contains four digits. 1000是四位数。 来自《简明英汉词典》
• The number 410 contains three digits. 数字 410 中包括三个数目字。 来自《现代英汉综合大词典》

4 auxiliary   

adj.辅助的，备用的

参考例句：

• I work in an auxiliary unit.我在一家附属单位工作。
• The hospital has an auxiliary power system in case of blackout.这家医院装有备用发电系统以防灯火管制。