Backchannel
（传递消息的）秘密渠道, 特殊途径
🗣️ 情景例句
What's wrong?
怎么了？
Snort! I didn't do anything wrong!
哼哼，我没做错什么事啊。
It was very different from modern car races but no less exciting.
它虽然与现代汽车比赛大不相同，但激动人心的程度并不亚于现代化汽车大赛。