십이월十二月 December 이십二十 twenty 이월二月 February 일석이조一石二鳥 killing two birds with one stone 신토불이身土不二 belief that domestic farm products are the best 십이지장十二指腸 duodenum 유일무이唯一無二 being the one and only 이경二更 second watch of the night 이등二等 second; second class 이등병二等兵 private; ordinary seaman; airman 이등분二等分 bisection 이루二壘 second base 이류二流 second-rate; second-class 이륜차二輪車 two-wheeler 이모작二毛作 double-cropping 이병二兵 private; ordinary seaman; airman 이분법二分法 dichotomy 이산화 탄소二酸化炭素 carbon dioxide 이세二世 coming generation; future generation 이원론二元論 dualism 이율배반二律背反 antinomy; contradiction 이인칭二人稱 second person 이중二重 being double; being two fold; two times 이중고二重苦 double whammy 이중성二重性 duplicity; duality 이중적二重的 being dual 이중적二重的 dual 이중주二重奏 duet 이중창二重唱 duet 이진법二進法 binary system 이차二次 being second; being secondary 이차원二次元 two dimensions; being two-dimensional 이차적二次的 being second; being secondary 이차적二次的 second; secondary 이팔청춘二八靑春 age of sixteen; prime of youth; springtime of life 일구이언一口二言 double-dealing; speaking with a forked tongue; being double-tongued 십이지十二支 the twelve horary signs 이십사절기二十四節氣 twenty-four seasonal divisions