Backstraps
n. 书背，书脊；(靴子或鞋后跟上的)提带
🗣️ 情景例句
I am exhausted. My new exercise class is so hard.
我太累了。我那新的健身班太难了。
He is speaking on another phone.
他正在接听别的电话。
That's a big box. Is it heavy? Please let me help you.
这是个大盒子。重吗？让我来帮你。