词根词缀：centro-, centr-, centri-, kentro-

【来源及含义】Greek > Latin: center; middle point, mid point; focus, focal point, focalize; zero in on

【相关描述】This element originally meant "sharp point, goad" or "spur".

【同源单词】acentric, acentric, acrocentric, allocentric, ambulatory surgery center, amphicentric

词根词缀：ethno-, ethn-

【来源及含义】Greek: people, race, tribe, nation; group of people living together; community, family

【相关词根词缀】Related "people, human" word units: anthropo-; demo-; ochlo-; popu-; publi-.

【同源单词】ethnagogue, ethnarch, ethnarchy, ethnic, ethnically, ethnicism