/-{-{xītīng}-}-/, /hei̯⁵⁵ tʰɪŋ⁵⁵/, /hei1 ting1/, /hei1 ting1/, /héi1 ting1/, /shiting/, /siting/、/ㄒㄧ ㄊㄧㄥ/
(有機化學) 含有C=C鍵（碳─碳雙鍵）的碳氫化合物，屬於不飽和烴