Backchannel
（传递消息的）秘密渠道, 特殊途径
🗣️ 情景例句
Her surgery needs quite a lot of money.
她的手术得花不少钱。
To a boiling pot flies come not.
苍蝇不叮沸水壶。
Yes, very nice, thank you.
是的，非常愉快，谢谢。