系统内可多方同时通话，且通话不通过扬声器向外广播。
The system can realize multi-user call and the sound may not spread from the speaker.
当同时通话的用户数达到一定数量，多址干扰达到一定限度，系统将不能正常工作。
When many users connect at the same time, system can not work since multipath interference exceeds a limit.
在手机上通话的同时与人分享你的屏幕内容，这个功能的实现比你想象的要难得多。
Sharing your screen with someone while chatting on the phone is one of those things that's much harder than it ought to be.
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