双元音

diphthong

surname Shuang

two / double / pair / both / even (number)

surname Yuan / the Yuan or Mongol dynasty (1279-1368)

currency unit (esp. Chinese yuan) / first / original / primary / fundamental / constituent / part / era (of a reign) / meta- (prefix) / (math.) argument / variable / (Tw) (geology) eon

vowel

sound / noise / note (of musical scale) / tone / news / syllable / reading (phonetic value of a character)