科林忘了他背有问题。

Colin forgot that he had ever had a back.

youdao

他的下背有一道手术疤痕。

A surgeon's scar cuts across his lower back.

youdao

死记硬背有很多的局限性，这一点我们必须承认。

We should admit that rote learning has a number of limitations.

youdao

So, what I'll ask is can you stand up if you had your particle bounce back?

有13个背散射,助教们？

麻省理工公开课 - 化学原理课程节选

My back hurts. And we have a lot to wash.

我的背受伤了。我们有很多东西要洗。

Do you mind 实战 - SpeakingMax英语口语达人

it looks like we were a little bit successful, I saw some backbouncing.

我看到有些球被背散射了，我们要看看有多少个。

麻省理工公开课 - 化学原理课程节选