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1·They are connected by marriage.

他们已联姻。《牛津词典》

2·I am related to him by marriage.

我跟他是姻亲关系。

3·I am related to her by marriage.

我和她有姻亲关系。

4·She is related to me by marriage.

她和我有姻亲关系。

5·Love: a temporary insanity curable by marriage.

爱情：可以由婚姻治愈的暂时的疯狂。

6·She is English by birth but French by marriage.

她是英国血统，但嫁给了法国人而加入了法国国籍。

7·Love is a temporary insanity curable by marriage.

爱情是暂时性的癫狂，必须用婚姻来治愈。

8·French by birth and a British subject by marriage.

出生时是法国人，因结婚成为英国臣民。

9·Connected by marriage, you mean, said Franz, laughingly.

“婚姻关系吗？”弗兰兹大笑着说。

10·The two families are closely related to each other by marriage.

这两个家庭由于婚姻关系而紧密联系在一起。