Part 1 字首 表示{方位}的字首 pre =before 前
入门字
prevent (v.)防止
pre/vent
before/come
进阶字
1. preclude (v.) 排除...的可能
pre/clude
before/close
The approaching typhoon precludes any chance of a ball game tomorrow.
飓风接近，所以明天不可能举行球赛了。
2. prescience (n)未卜先知
pre/sci/ence
before/know/名词字尾
The investor demonstrated remarkable prescience by selling his stocks before the market crashed.
这位投资人在故事崩盘前把股票脱手，展现了未卜先知的本领。
3. presentiment (n.) 预感
pre/sent/invent
before/feel/名词字尾
The man had a presentiment that something might go wrong, so he chose not to board the plane.
这个人有预感会处事，所以决定不上飞机了。
4. unprecedented ](a.)史无前例的
un/pre/ced/ented
not/before/go/形容词字尾
The president's proposal to visit Mainland China was unprecedented.
总统提议访问大陆，是前所未有的提议。