我们都是UNIX系统“talk”和“ntalk”的重度用户(大量使用者)，那时候就让我们在互联网上实现实时双向通信，我们也充分利用电子邮件并偶尔打打长途电话。
We were heavy users of UNIX 'talk' and 'ntalk', which allowed real-time two-way communication over the Internet back then, and made good use of email and the occasional long distance phone call.
可视电话就是一种点到点的多媒体通信平台，它能实时双向传输通话双方的图像和语音信号。
Viewphone is a kind of video communication terminal that base on point to point, it makes use of current telephone network to transmit real-time bi-directional video and audio.
集中管理中心与集中管理式电话计费器之间可通过公众电话网以拨号方式建立双向通信链路，从而实现对集中管理式电话计费器的远程管理。
Between the center and the devices, the duplex communication links are created through the public switched telephone network, thus the remote management for the devices is realized.
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