a secret or unusual way of passing information to other people (传递消息的)秘密渠道,特殊途径 - (
linguistics )语言学 a sound or sign that somebody makes to show that they are listening to the person who is talking to them 言语反馈示意,反输, 附应 (以声音或示意作为对说话人的反馈)
See also: back channel
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