user-to-user signaling造句

例句与造句

1. User - to - user signalling uus
   用户至用户信令
2. User - to - user signalling
   用户至用户信令
3. Isdn . telecommunications - integrated services digital network - user - to - user signaling supplementary service
   电信.综合服务数字网络
4. It's difficult to find user-to-user signaling in a sentence. 用user-to-user signaling造句挺难的