Complementary things are different from each other but make a good combination.
例句
To improve the quality of life through work, two complementary strategies are necessary...想通过工作提高生活质量，需要两个相辅相成的策略。Many plain tiles and complementary borders are also available...多种素色的瓷砖和配套的腰线也在售
ADJ
补充医学的(不同于西医的治疗方法，如针灸、顺势疗法)
Complementary medicine refers to ways of treating patients which are different from the ones used by most Western doctors, for example acupuncture and homoeopathy.
例句
...combining orthodox treatment with a wide range of complementary therapies.把传统的治疗方法与各种补充疗法结合
英英词典释义
Noun
1. a relation between two opposite states or principles that together exhaust the possibilities
2. the interrelation of reciprocity whereby one thing supplements or depends on the other;