autography：亲笔，亲笔签名 

词根词缀：auto-自己 + -graph-写 + -y名词词尾

• unctuous
• under
• under-
• underachieve
• underage
• undercurrent
• underestimate
• undergo
• undergraduate
• underground
• underhand
• underlie
• underline
• underling
• underlying
• undermine
• underneath
• underpass
• underpin
• underscore
• undersecretary
• undershoot
• understand
• understanding
• understudy