lower back

基本解释

Eases stiff lower back and backs of legs.
放松坚硬的下背部和腿后侧。
As is frequently the case, Catherine is standing slightly ahead of William, this time enabling him to place his right hand on her lower back as he guides her into position.
大部分情况下，凯瑟琳会稍稍站在威廉前面一点，这样的话威廉就能把他的右手放在她的背部下方，从而引导她站在合适的位置。
Swimming strengthens your lower back and abdomen without putting strain on your joints.
游泳增强你的下背部和腹部力量，放松关节。

Doctors placed small electrodes in his lower back.
I just want to make mention of this in case there's ever doubt, generally parentheses do solve your problem as an arithmetic but do realize this is some lower level details we'll come back to over time.
是想告诉大家如果你对某些式子的前后运算关系不确定，就加上括号,这都是一些小细节,我们以后还是会再提到的。
哈佛公开课 - 计算机科学课程节选
So just-- and we will come back to this and flush out some of these lower level details.
那么，我们还是回到这里，略去一些,没用的细节。
哈佛公开课 - 计算机科学课程节选

Heated seats can help ease creaking joints or lower back pain while en route.
FORBES: Best New-Cars (And Features) For Senior Drivers