"Spousal relationship" 或 "Marital relationship" 可以用来表示夫妻关系。
来源：spouse 是英文中的配偶， marital 是婚姻的意思。
例句：
"John and Mary have a strong spousal relationship." (约翰和玛丽有着坚固的夫妻关系。)
"The marital relationship between Tom and Jane has been strained due to financial issues." (汤姆和简因财政问题而关系紧张。)