shé jiān yīn
apical consonant (produced with the tip of the tongue, i.e. d or t)
shé jiān hòu yīn
retroflex sound (e.g. in Mandarin zh, ch, sh, r)
shé jiān qián yīn
alveolar
consonants z, c, s produced with the tip of the tongue on the alveolar ridge
shé jiān chàn yīn
alveolar trill (e.g. Russian r sound)