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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
He was in trouble with the Customs.
他在海关那里有了麻烦。
I tried to call you, but the line was busy.
我试着给你打电话，但老占线。
She became more and more beautiful.
她变得越来越漂亮了。