Compared with the prior art, the use of the invention enables the management of a plurality of simultaneouscommunication sessions to be simple and easy.
相较于现有技术，本发明的使用可以使管理多个同时通信会话变得简单易行。
2
The Three-Party Service enables a user to establish a three-way conversation, i. e. a simultaneouscommunication between the served user and two other parties.
三方业务使用户能建立一个三方通话，即在被服务的用户和另两方之间同时进行通信。
3
Communication in authentic situations usually requires the simultaneous engagement of lexical, grammatical, phonetic and pragmatic language abilities.