Backchannel
（传递消息的）秘密渠道, 特殊途径
🗣️ 情景例句
Don't drink then drive.
不要酒后开车。
Great designs require great consideration.
宏伟的计划须要慎重考虑。
He was still smiling when the door opened and his wife came in.
他正笑着的时候门开了，他的妻子走了进来。