Backchannel
（传递消息的）秘密渠道, 特殊途径
🗣️ 情景例句
OK.
好。
This offer must be withdrawn if we haven't received your reply within five days.
如果5天之内我方未必到贵方答复，该盘撤消。
Shivering in their wet clothes, the teenagers looked on while three men dived repeatedly into the water to locate the dish.
那些孩子们穿着湿衣服哆嗦，看着3个工人轮潜入水中以确定盘子的位置。