backchannel

基本解释

Therefore English teachers should make efforts to motivate students to give more backchannel support.
因此，广大英语教师应尽力激发学生的反馈支持，搞好教学。
Still, we think it would be a great idea. (Who wouldn't want to join a live backchannel of ABC's "Lost", for example?
（谁不想加入一个ABC公司的剧集”迷失“的即时回馈组呢？比如说，那个黑烟怪物是什么？）
This spawned system of backchannel communications that eroded trust between top executives.
这种状况滋生了“打小报告”的沟通方式，同时令高层管理人员之间的信任度大打折扣。
Many scholars and English teachers have been studying backchannel support for years, which has great value in improving English teaching.
摘要基于广大学者和英语教师对反馈支持的研究，笔者认为反馈支持对英语教学有很大的促进作用。
Given how rare the non-joiner is, it's quite amazing how much has been written on it (such as the BackChannel and Keith Gilbert's trick on using the non-joiner in bulletted lists.
最后，对于基于罗马语系的语言极少需要(或者应该)使用可选分隔符。但是，在基于手写体语言中，诸如阿拉伯或者波斯语，可选分隔符就显得很重要。

a method of communication or discussion that is not direct or made public
to communicate or take part in discussions in a way that is not direct or made public