411 REFERENCE · Wikibooks
Pinyin/Apostrophe
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Pinyin#Pinyin tone marking
An apostrophe is a punctuation mark that is used to show a separation in a word.
Piēhào shì zài yīgè dāncí zhōng yònglái biǎoshì gékāi de biāodiǎn fúhào.