She sometimes asks if I want a back rub.是什么意思？

She sometimes asks if I want a back rub.

她有时会问我想不想做个背部按摩。

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

sometimes

adv. 有时，间或，时

例句
I want to work at home on a Tuesday but as it turns out sometimes it's a Wednesday or a Thursday.
我想周二在家工作，但实际上有时却是周三或是周四。

asks

v. 问( ask的第三人称单数 )，询问，要求，请求；

例句
A feverish child refuses to eat and asks only for cold drinks...
发烧的孩子不愿吃东西，只会要冷饮。

if

conj. 如果，倘若，即使，〈口〉是否，假设；n. 条件，设想；

例句
She was old enough to absent herself from the lunch table if she chose...
她长大了，可以自己做主不来吃午餐了。

want

v. 想要，希望，打算，需要…在场；n. 需要的东西，缺少，贫穷；

例句
I want to be honest, honest above everything else.
我想要做到诚实，一切以诚实为上。

back

n. 背，背部，背面，反面，后面，后部，（椅子等的）靠

例句
He looked back at the abject, silent girl and repeated his question.
他转过头看着这个噤若寒蝉的女孩，又重复了一遍他的问题。

rub

vt. 擦，摩擦，用…擦，触怒，（使）相互磨擦；vi. 接触，摩擦，擦伤，在困境中持续下去；n. 摩擦的动作，表面不平，阻碍，困难；

例句
They might not have two cents to rub together, but at least they have a kind of lifestyle that is different.
他们也许穷得叮当响，但他们至少拥有一种不同的生活方式。