作业帮背沟道什么意思
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背沟道什么意思
背沟道什么意思
背沟道什么意思
Backchannel is the practice of using networked computers to maintain a real-time online conversation alongside live spoken remarks.
The term "backchannel" generally refers to online conversation about the topic or the speaker.Occasionally backchannel provides audience members a chance to fact-check the presentation.
就是背地里的意思