Back channel
[计]反向信道
🧩 词语组成解析
back
[bæk]
n. 背，背部;背面，反面;后面，后部;（椅子等的）靠背;
vt. 使后退;支持;加背书于;下赌注于;
vi. 后退;倒退;
adj. 背部的;后面的;以前的;拖欠的;
adv. 以前;向后地;
🗣️ 情景例句
Let's get Marilyn.
还是叫Marilyn来吧。
Man's best plans often miscrarry.
神机妙算，常常失算。
Eric had been the eldest son of the family, very much older than his two brothers.
埃里克是这家长子。