Marriage is a lottery. 【谚】 结婚如买奖券(结局难预料).
Marriages are made in heaven. 【谚】 姻缘由天定.
his [her] uncle by marriage 夫系[妻系]的叔伯辈姻亲
Scotch marriage =common-law marriage/give...in marriage (to...) 把…嫁出
take...in marriage 娶…;嫁给…
religious marriage 宗教[正式]结婚仪式
marriage at a registry
mixed marriage.