Backchannel
（传递消息的）秘密渠道, 特殊途径
🗣️ 情景例句
How ofter have met with our competitors?
你多久遭遇我们的竞争对手一次？
How many pieces are you going to buy?
你要买几块？
Look, Gary!That policeman's waving to you.He wants you to stop.
瞧，加里！那个警察正朝你挥手呢。他要你停下来。