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n. 反向通道; 〈美〉秘密渠道; 非正规途径
🧩 词语组成解析
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[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
I've been looking forward to meeting you.
我一直盼望能有幸认识你。
Behind bad luck comes good luck.
塞翁失马，焉知非福。
No one could account for the fact that one of the boxes was extremely heavy.
其中有只箱子特别重，可谁也弄不清是怎么回事。