monogamous
adj. 一夫一妻的；[动] 单配的
例句
Only about five percent of mammals are monogamous.
只有约百分之五的哺乳动物是单一配偶的。
《柯林斯英汉双解大词典》
One theory is that bipedality evolved in conjunction with the nuclear family: monogamous parents cooperating to care for their offspring.
有一种理论认为，两足动物的进化与核心家庭有关：一夫一妻制的父母合作照顾他们的后代。
Most birds are monogamous.
大多数飞禽都是单配性的。
《牛津词典》
