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Because SS7 has more intelligent capabilities than User-Network Interface protocols such as ISDN Primary Rate Interface, SS7 can help ease congestion across the Internet. 由于七号信令比诸如ISDN的基础速率接口等用户网络接口协议更具智能功能，所以七号信令有助减轻因特网上的拥挤。
Because SS7 has more intelligent capabilities than User-Network Interface protocols such as ISDN Primary Rate Interface,SS7 can help ease congestion across the Internet. 由于七号信令比诸如ISDN的基础速率接口等用户网络接口协议更具智能功能，所以七号信令有助减轻因特网上的拥挤。
Primary Rate Interface (PRI) is an ISDN interface for primary rate access , which consists of a single 64-kbps D channel plus 23 (T1) or 30 (E1) B channels for voice or data. 主速率接口是一个适用于主速率通道的ISDN接口，它是由一个单个的64-kbps的D通道再加23个（T1）或30个（E1）语音或数据B通道构成的。
A long distance phone company can provide ANI which may arrive over the D channel of an ISDN primary rate interface circuit or via a dedicated single line before the first ring. 美国有各种ANI，长话公司能提供ANI，它可在ISDN基本速率接口电路的D信道上到达，或在首次振铃之前通过专用线到达。
PRI (Primary Rate Interface) 初始速率接口
primary rate interface 基群速率接口
Interfaces for the 1544 kbit/s primary rate and for the 2048kbit/s primary rate are described. 本建议描述了1544kbit/s一次群速率和2048kbit/s一次群速率的接口。
The credit rating interface shown in Listing 3 provides credit history information. 清单3所示的信用级别评定接口提供了信用历史信息。
The disease is still in its primary stage. 这疾病仍然在初发阶段。
The little boy left primary school at eleven. 这个小男孩十一岁时小学毕业。
Sure. We are friends since primary school. 当然，我们从小学就是朋友了。
I started primary school when I was 5 years old. 我五岁时开始读小学。
A primary cause of Tom's failure is his laziness. 懒惰是汤姆失败的主要原因之一。
Primary school teachers use a lot of visual aids. 小学教师使用大量的视觉教具。
Love and hatred are primary emotions. 爱和恨是基本的情感。
The Democratic primary was held this month. 民主党候选人初选於本月举行。
Primary education comes under the umbrella of local government. 小学教育受地方政府的保护。
He only accepted the primary education off and on in his childhood. 他小时候只断断续续地接受过初等教育。
The primary reason for advertising is to sell more goods. 做广告的根本目的是要多出售货物。
Collins was nosed out by his opponent in the primary. 柯林斯在初选中就被他的对手击败了。