Back-scratching
n. 互相利用
🧩 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;
v. 擦伤；划伤；刮痕（scratch的ing形式）
🗣️ 情景例句
I love numbers.
我喜欢弄数字。
How much is it to rent an economy car?
租一辆经济车要多少钱？
The sides of the dish were so smooth that it was almost impossible to attach hawsers and chains to the rim without damaging it.
盘子四边十分光滑，要在盘边拴上绳索或链条而同时又不损坏它是很难办到的。