大嫂的英文：
eldest brother's wife
sister-in-law

参考例句：

The kind-hearted field mouse found her and took her in.
好心的田鼠大嫂发现了拇指姑娘并收留了她。

eldest是什么意思：
a. 最年长的;年事最高的

Tom is the eldest of the family.
汤姆是子女中最大的一个。

The house and estate are entailed on the eldest daughter.
这所房子和地产限定由长女继承.

The house and estate be entail on the eldest daughter
这所房子和地产限定由长女继承

brother是什么意思：
n. 兄弟；教友；同事；战友；同胞
int. 我的老兄

He has scrap with his brother.
他与他的哥哥打架。

My brother is a football maniac.
我哥哥是个足球迷。

My brother and she are engaged.
我兄弟和她订婚了。

wife是什么意思：
n. 已婚女子，妻子

Ann was cast as the wife.
安妮被选派扮演妻子的角色。

My wife was there among others.
我妻子和其他一些人在那儿。

The wife is the key of the house
妻子是家庭的关键