She arched her back and stretched herself.是什么意思？

She arched her back and stretched herself.

她弓起背，舒展身体。

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。

arched

adj. 拱形的，弓形结构的；v. 成弓形弯曲“arch”的过去式和过去分词；

例句
...a fortified arched bridge spanning the River Severn.
横跨塞文河的加固拱桥

her

pron. (she的宾格)她，(she的所有格)她的，她，指某个国家，（一艘）船；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

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。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

stretched

v. 伸展，拉紧( stretch的过去式和过去分词 )，延伸，拉长，损伤；

例句
She stretched her arms out...
她张开双臂。

herself

pron. （反身代词）她自己，（用以加强语气）她亲自，她本人；

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。