complementaryadj.
英 kɒmplɪ'ment(ə)rɪ | 美 'kɑmplə'mɛntri
中文adj. 补足的，补充的
词根词源
complementary (adj.)1620s, "ceremonious," from complement + -ary. Sense "forming a complement" attested from 1829, earliest in complementary colors.
关键词