前缀 up-

汉：来源于盎格鲁-撒克逊语，意为"upward,thoroughly"。

英：prefix with various senses, from O.E. up (see up (adv.)), corresponding to similar prefixes in other Germanic languages.

1.upgrade
v.raise to a higher grade使升级，提高质量
例句：Windows software by Microsoft can be easily upgrade.
微软公司的软件Windows很容易升级。

2.upheaval
n.great and sudden change动荡；剧变
例句：Political upheaval follows every coup attempt,successful or not.
不客是成功还是失败的政变企图，都伴随着政治大变。

3.upstart
n.person who has suddenly risen to wealth ,power or highter social position.暴发户，顷刻间飞黄腾达者
a.newly rich,powerful,etc.暴发的，暴富的。
Micro-Game is an upstart computer game maker.
微型游戏是最近才出现的一家游戏制造商

4.uproot
v.pull up by the roots将...连根拔起；（使）离开家园
Stong winds uprooted several trees.
强风将几棵树连根拔起

5.upturn
n.upward turn;change for the better回升；好转
例句：Any upturn in the market would be a welcomed sign of economic recovery.
市场任何好转都是经济复苏的可鼓征兆