Backstraps
n. 书背，书脊；(靴子或鞋后跟上的)提带
🗣️ 情景例句
You probably heard about it. We have private teachers in our holiday.
或许你已经听说过。我们交大的学生在假期间做家教。
I'm sure you need an original signature, not a faxed copy.
我知道你们需要的是原件，不是传真件。
Well, I haven't got much either!
唉，我也不多了。