monogamous
  一夫一妻的
  mo·nog·a·mous /məˈnɑgəməs/ 形容詞
  單配的,一雌一雄的
  Mo·nog·a·mous a.
  1. Upholding, or practicing, monogamy.
  2. Bot. Same as Monogamian.
  3. Zool. Mating with but one of the opposite sex; -- said of birds and mammals.
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  monogamous
       adj : (used of relationships and of individuals) having one mate;
             "monogamous marriage"; "monogamous for life" [ant: polygamous]