联姻的英文：
unite by marriage
connections through marriages

参考例句：

The two families were united in marriage
那两个家庭通婚联姻。

She was allied with(to)that rich family(by marriage)to free herself from poverty
她为摆脱贫穷而与那富人联姻。

A woman who holds a title by association, as the wife or widow of a peer
贵族夫人或遗孀贵族的妻子或守寡贵妇等因联姻而获贵族头衔的女人

If the emperor remained on the throne, Gerard required a different alliance to aid his career.
假如皇帝在位，则杰拉就需要一个不同的联姻来帮助他的事业。

Now tell me if you will keep faith and truth with my master.
现在请告诉我，你们是否愿意以诚信待我主人，与他联姻。

unite是什么意思：
v. （使）团结，（使）联合；（使）混合；合并；兼备

Expand the patriotic united front and unite with all forces that can be united.
壮大爱国统一战线，团结一切可以团结的力量。

The conception of the United Nations was in 1945.
联合国创始于一九四五年。

The meter reads 5500 units.
仪表标明为5500单位。

marriage是什么意思：
n. 结婚；婚姻生活；婚礼

an irregular marriage.
不合法的婚姻

You will notice the drift in this marriage.
在这桩婚姻中你会注意到流向。

Marriage comes by destiny
姻缘命中定

connections是什么意思：
n. 连接；连接点；联运交通工具；熟人；亲属

elbow connection
弯头连接

A connect request was made on an already connected socket.
在一个已经连接的套接字上做了一个连接请求。

connection point manager.
连接点管理程序。