n. technical terms of particular subject(某学科的)专门用语，术语

　　a word not used except in medical terminology仅用于医学的专业词

　　unfold [近]open

　　v. ①to spread open or flat展开;打开②if a series of events unfold, they happen发展;展开

　　We discover that Jack isn't as innocent as he seems, as the plot unfolds. 随着剧情的展开，我们发现杰克并非像他看上去那样单纯。

　　unfortunate [同]unlucky

　　adj. having bad luck; caused by bad luck不幸的;倒霉的

　　He was unfortunate to lose in the final round他不幸在最后一轮输了。

　　uniform

　　n. a particular type of clothing worn by all the members of a group or organization such as the police, the army, etc. 制服;工作服

　　I used to hate wearing a school uniform. 我曾经讨厌穿校服。

　　历年雅思(IELTS)考试真题高频词汇解析-vacant

　　vacant [近]empty

　　adj. (of a seat, hotel room, house, etc.)empty; not being used空着的;未被占用的The seat next to him was vacant他旁边的座位空着。