痛楚会延伸到下背和大腿处。

Pain that radiates to your lower back and thighs

youdao

他的下背有一道手术疤痕。

A surgeon's scar cuts across his lower back.

youdao

我的下背较弱，这与残疾有关，所以尤为重要。

I have a weak lower back, which is related to my disability, so that's particularly important.

youdao

You don't have to do this for Wednesday but let's say for next Monday, and that is: I'd like you to memorize a short poem by Yeats or by Frost, either one.

你们不用今天做,下星期一吧：,我想让你们背一首短诗,叶芝或者弗罗斯特的都行。

耶鲁公开课 - 现代诗歌课程节选