upright [up- = upward 向上; right a. 直的=>“being right upward 筆直向上的”→]a. standing up straight; erect直立的；豎立的/The old man sat upright in a chair, facing the invader's gun. 面對(duì)著人侵者的槍口，老人筆直地坐在椅子上。

uptight [ up- = up 起來；tight a. 緊的→“being tight up in mind 精神上緊張起來”→]a. very uneasy; nervous緊張的；不安的/ When she was waiting for the interview, she was really uptight.

在等待求職面試時(shí)，她確實(shí)非常緊張。

下面介紹up-改變?cè)~基單詞詞性的兩個(gè)例子。

uproot [ up- =to make. . . upward 使...向上；root n. 根=>“to make the roots upward使樹根朝上 ”→]v. tear or pull up by the roots 連根拔 / The storm uprooted many trees.暴風(fēng)雨將許多樹連根拔起。

upstairs [ up- = up 在…上；stairs n. 樓梯 a. & ad. up the stairs在樓上（的）/ The boy ran upstairs . 那男孩跑上樓去。

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