/,kɒmplɪ'mentrɪ; ,kɑmplə`mɛntərɪ/
adj ~ (to sth) combining well to form a balanced whole 紧密结合成相称的整体
*They have complementary personalities, ie Each has qualities which the other lacks. 他们二人的性格可取长补短（各自有对方缺乏的性格）.
* His personality is complementary to hers. 他的个性与她的相反相成. ,complementary `angle either of two angles which together make
90 余角（两角之和为90这两个角就互为余角）. ,complementary `colour colour of light which when combined with a given colour makes white light (eg blue with yellow) 互补色（混合後产生白色光的两种色光, 如蓝和黄）.

adj
complementary things go well together, although they are usually different
　The computer and the human mind have different but complementary abilities.
technical complementary colours of light are very different and combine to make white
technical two angles that are complementary add up to 90 degrees
>complementarity [,kɔmplɪmen'tærɪti (US) ,kɑːm-/