a secret or unusual way of passing information to other people (傳遞消息的)秘密渠道,特殊途徑 - (
linguistics )語言學 a sound or sign that somebody makes to show that they are listening to the person who is talking to them 言語反饋示意,反輸, 附應 (以聲音或示意作爲對說話人的反饋)
See also: back channel
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