two-way channel

Base on the quantum theory, QKD can make enables two participants to share secure keys over an insecure public channel in real time.

量子密钥分配以量子理论为基础，可以在不安全的公共信道上安全地实时分配密钥。

Premiere, a subscription channel which began in 1991, shows live football covering the top two divisions...

开播于 1991 年的付费电视频道 premiere 实况转播两大顶级足球联赛的赛事。

Premiere, a subscription channel which began in 1991, shows live football covering the top two divisions.

开播于1991年的付费电视频道premiere实况转播两大顶级足球联赛的赛事。

Compared with the other two kinds of digital TV broadcasting modes ( satellite and cable), digital TV terrestrial broadcasting faces a much more complicated channel, many kinds of interferences exist.

与其他两种数字电视传输方式（卫星与有线）相比，数字电视地面广播中信道条件非常复杂，存在各种干扰。

Premiere, a subscription channel which began in 1991, shows live football covering the top two divisions

开播于1991年的付费电视频道premiere实况转播两大顶级足球联赛的赛事。