Phonetic System > Dental Sibilant Sound
Dental Sibilant Sounds: Flat lips. Tip of the tongue close to the upper and lower teeth to make sounds that seem to be with vibration like sh, ch, gi... in English.
z: As "ds" in kids. Ex. zǎoān (good morning), zàijiàn (goodbye), zàishuōyíbiàn (say it one more time)
c: As "ts" in cats. Ex. cāimí (guess riddles), cèsuǒ (restroom), cíqì (porcelain), Zhōngguócài (Chinese food)