Backchannel
（传递消息的）秘密渠道, 特殊途径
🗣️ 情景例句
It's so good to have you home again ...
真高兴 ，你又回家了……
I picked up my cards.
我捡起了我的卡片。
He sends me interesting postcards from the ports where the ship stops.
他还从船停泊的海港给我寄来了明信片。