to indicate the pronunciation of Chinese characters using Pinyin or Bopomofo etc / phonetic notation / (specifically) Bopomofo (abbr. for 注音符號|注音符号[zhu4 yin1 fu2 hao4])
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