declare [de- = completely 完全；clar = to make clear 使清楚；-e => “to make completely clear 使…完全明白”→]vt. say openly or strongly 宣布；斷言/ He declared that he was completely innocent.他宣稱自己是完全無辜的。

declaration n. 宣布；宣言 

declarative a. 宣言的；說明的

demand [de- = completely 完全；mand = to order 命令→]vt. ask for as a right or with authority 要求 / The policeman demanded the thief's name.警察要小偷說出姓名。

demandant n. 提出要求者，原告

下面介紹de-與動(dòng)詞相結(jié)合生成的派生詞。 

decentralize [de-=to undo 取消；centralize v. 集中=>“to undo that of centralizing 取消集中的做法”→]vt. distribute (authority or power)分散(權(quán)力等)/ The system of decentralized management took effect immediately. 分散經(jīng)營(yíng)的制度立見成效。

decentralization n. 分散權(quán)力，權(quán)力下放

decompose [de- = to undo 取消；compose 組合 v. =>“to undo that of composing 取消組合的形式”→]vt. separate into what a substance is made of 分解 / A prism decomposes sunlight into its various colours.三棱柱把陽光分解成各種顏色的光。 decomposition n. 分解（作用）；解體

demobilize [de- = to undo 取消；mobilze v. 動(dòng)員=>“to undo that of mobilizing取消動(dòng)員軍隊(duì)的狀態(tài)”→]vt. remove from the army to peacetime life 使復(fù)員 / When the war was over, he was demobilized and sent home.戰(zhàn)爭(zhēng)結(jié)束后，他被復(fù)員回家。

demobilization n. 復(fù)員，遣散