sentence: The sibilant -LRB- `` dental '' -RRB- consonants were modified to represent the two series of Chinese sibilants , alveolar and retroflex , a `` round '' vs. `` sharp '' distinction -LRB- analogous to s vs sh -RRB- which was never made in Korean , and which was even being lost from southern Chinese .
question: what was _ distinguished _ from something ?
answers: round