confederacy——A union of persons， parties， or states; a league联盟=ally One that is allied with another， especially by treaty同盟者

　　conceal——To keep from being seen， found， observed， or discovered; hide隐藏=hide

　　dramatically——Arresting or forceful in appearance or effect引人注目的=striking

　　durable——Lasting; stable持久的;稳定的=lasting

　　domains——[计]域=fields

　　domestic——Tame or domesticated. Used of animals驯养的=tame

　　dominate——To enjoy a commanding， controlling position in占支配地位=be prevalent in

　　divergence——Difference， as of opinion意见分歧difference

　　diverse——Made up of distinct characteristics， qualities， or elements多种多样的=various

　　dogma——An authoritative principle， belief， or statement of ideas or opinion， especially one considered to be absolutely true信条=belief

　　distinction——The condition or fact of being dissimilar or distinct; difference差别=difference

　　distinct——Readily distinguishable from all others; discrete有区别的，不同的=different， separate， definite

　　dispute——To argue about; debate就…进行争论=argument， disagreement

　　disseminate——To spread abroad; promulgate散布=spread， distribute

　　disposal——The act or process of getting rid of something除掉=get rid of

　　discrete——Constituting a separate thing; distinct分离的=separate Existing as an independent entity单独的

　　discard——To throw away; reject丢弃，抛弃=get rid of

　　diffuse——To become widely dispersed; spread out散布=travel To be transmitted， as light or sound; move or pass传送

　　differentiate——To constitute the distinction between区分=distinguish To perceive as being different or distinct区分

　　dictate——To prescribe with authority; impose命令;To issue orders or commands命令=determine To reach a decision; resolve解决，决定，=prescribe To set down as a rule or guide; enjoin指定，规定

　　devastate——To lay waste; destroy变成废墟，荒芜;破坏=ruin

　　device——A contrivance or an invention serving a particular purpose， especially a machine used to perform one or more relatively simple tasks机器=instrument A device for recording， measuring， or controlling， especially such a device functioning as part of a control system仪表

　　devoid of ——free of无……的，免于……的;摆脱了……的

　　destruction——The act of destroying毁灭=demolition The act or process of wrecking or destroying， especially destruction by explosives.摧毁破坏

　　detect——To discover or ascertain the existence， presence， or fact of查明;发现=discover， sense To become aware of; perceive感觉意识到

　　detectable——Can be discovered or ascertained the existence， presence， or fact可查明;可发现apparent， measurable，sizable

　　derive——To obtain or receive from a source得到=obtain，

　　To issue from a source; originate起源于=stem from

　　depression——An area that is sunk below its surroundings; a hollow下陷处=low

　　depressed——Low in spirits; dejected情绪低落的;沮丧的=saddened

　　deposit——To put or set down; place放置=place， lay

　　deplete——To decrease the fullness of; use up or empty out消灭，用完或用光=exhaust， run out

　　dense——Hard to penetrate; thick浓厚的=thick， heavy