degradation
n. 降級[反]elevation
n. 墮落；退化（生物）

degrade
v. （使）降級；（使）墮落
degrade oneself by cheating 因欺騙而自甘墮落
v. （使）退化

delegate
n. 代表
[同]representative

deliberate
adj. 深思熟慮的，蓄意的
a deliberate lie 存心的謊言
[同]intentional
adj. 審慎的，不慌不忙的
a deliberate speech 從容而謹慎的演說

deliberately
adv. 審慎地，蓄意地

denial
n. 否認
They didn’t admit his denial of guilt. 他們對他否認有罪不予承認。
[同]negation
n. 拒絕
the denial of a request for help 拒絕他人的求助
[同]rejection
[難點]
make a denial of … 否認…

denote
vt. 指示，表示
[同]indicate
vt. 意味著
The sign x usually denotes an unknown quantity. 符號x通常代表一未知數。
[同]mean

denounce
vt. 譴責，痛斥
be denounced as a coward 被指責為懦夫
[同]criticize
vt. 揭發，告發
denounce sb. as a spy 揭發某人為奸細
[難點]
denounce sb. to … 向…告發某人
They denounced the man to the police. 他們向警方告發了那人。

density
n. 濃密，密集
the density of a forest / the population 森林的茂密/人口的稠密
n. 密度（物理）；愚鈍

dentist
n. 牙醫

dependant
n. 靠別人生活，眷屬；侍從

deposit
n. 存款，押金，保證金
I drew 1,000 yuans from my deposit. 我從存款中提出一千元。
n. 礦床
oil deposit 油田

deposition
n. 免職，罷免；證言；淤積，沉淀

depression
n. 沮喪，消沉
He is suffering from mental depression. 他情緒很低落。
n. （商業）不景氣，蕭條期
[同]slump
n. 洼穴，坑
[同]hollow

deprive
vt. 剝奪，使喪失
These trees deprive my house of light. 這些樹遮住了我房屋的光線。
[同]strip
vt. 免去…的職務
[難點]
deprive sb. of… = sb. be deprived of … 剝奪某人的…
They deprived him of his rights. 他們剝奪了他的權利。

deputy
n. 代理人
act as a deputy for sb. 做某人的代理人
[同]agent
n. 代表，議員
a deputy to the National People’s Congress 人大代表
[同]representative
adj. 副的，代理的
a deputy mayor 副市長
[同]vice
[難點]
deputy for sb. 某人的代理人
deputy to … 某（組織，機構等）的代理人

derivation
n. 引出，導出；起源，由來
[同]origin

descendant
n. 子孫，后代，后裔[同] offspring

descent
n. 下來，下降
The descent is more difficult than the ascent. 上山容易下山難。
[反]ascent
n. 血統，世系
He is a man of noble descent. 他出身名門。
[同]ancestry

designate
vt. 指明,指出
designate boundaries 表明界限
vt. 指派，指定
He designated Smith as his successor. 他指定史密斯為他的繼承人。

desolate
adj. 荒蕪的，荒涼的
[同]deserted
adj. 孤獨的，凄涼的
She lived a desolate life. 她過著凄涼的生活。
[同]lonely

dessert
n. 甜食，點心

destine
vt. （常用被動）命中注定
They were destined never to meet again. 他們命中注定將永不再見。
[同]doom
vt. 預定，指定
[同]predetermine