She had to lengthen her stirrup leathers.是什么意思？

She had to lengthen her stirrup leathers.

她得放长马镫皮带.

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。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

lengthen

vt.& vi. 延长，伸长；

例句
She had to lengthen her stirrup leathers.
她得放长马镫皮带.

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。

stirrup

n. 马蹬；

例句
Jane put one foot in the near stirrup and turned to look at the stranger.
简一只脚就近蹬上马镫，转脸看着陌生人。

leathers

n. 皮，皮革( leather的名词复数 )；

例句
The papain can be made into depilatory for tanning the leathers and exquisite with good texture.
可制成皮革软化剂,经木瓜酶软化的皮革柔软、白、面细致,手感好.