one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit
science and technology is the number one productive force (from a 1978 speech by Deng Xiaoping 鄧小平|邓小平[Deng4 Xiao3 ping2] introducing the Four Modernizations 四個現代化|四个现代化[si4 ge5 xian4 dai4 hua4])