3873.dawn(動)破曉；開始(名)黎明
(動):The space age dawned in the twentieth century.
太空時代始于二十世紀。
(名):My grandfathar wakes up at dawn.
我爺爺在黎明時起床。

3874.daybreak(名)破曉
We left before daybreak.
我們是在黎明前出發的。

3875.daydream(動)做白日夢(名)白日夢
(動):I would spend hours daydreaming aboUt a house of my own.
我常常一連好幾個小時都在幻想自己有一棟房子。
(名):She stared out of the window,lost in a daydream.
她凝視窗外，沉浸在幻想之中。

3876.daylight(名)日光
It is easier to read by daylight than by lamplight.
在日光下讀書比在燈光下省力。

3877.deadline(名)最后期限、截止日期
I pretar to work to a deadline.
我喜歡按規定的期限完成工作。

3878.deaf(形)聾的
He was deaf to my requests for help.
他對我的求助充耳不聞。

3879.deafen(動)使聽不見
The noise of the siren was deafaning her.
汽笛聲震得她耳朵都快聾了。

3880.dealer(名)商人
同義詞businessman
He's a dealer in sacand-hand cars.
他是個經銷二手汽車的商人。

3881.deathbed(名)臨終時所臥的床
He told me the truth on his deathbed.
他臨終時向我吐露了真情。

3882.debate(動)(名)辯論
(動):The subject was hotly debated.
這個題目曾經被熱烈地辯論過。
(名):The fiece debate is going on.
一場辯論正在激烈進行中。

3883.debt(名)債務
I don't want to lend any more money to him;he's already in debt to me.
我不想再借錢紿他了，他已經欠我錢了。

3884.debut(名)首映；首次出版；初次登臺
He will make his debut for the first team this week.
本周他將在第一支出場的隊伍中首次亮相。

3885.decade(名)十年
Many astrophysicists have been convinced for the better part of a decade that it is true.
許多天體物理家七八年來一直認為這一論說是正確的。

3886.decay(名)腐爛
同義詞spoil
The landlord had let the building fall into decay.
房東放任不管，房子破爛不堪。

3887.decisive(形)決定性的、果斷的
She has played a decisive role in the peace negotiations．
她在和平協商中起了關鍵作用。

3888.decidedly(副)明確地
Their relationship is beginning to look decidedly shaky.
他們的關系明顯開始動搖。

3889.deck(名)甲板
As the storm began,everyone disappeared bolow deck.
暴風雨來臨時，所有的人都躲在甲板下面去了。

3890.decorate(動)裝飾
They decorated the room with flowers and balloons．
他們用花和氣球裝飾了房間。

3891.decoration(名)裝飾，裝潢
I knew something about decoration.
我對裝潢了解不少。

3892.decrease(名)(動)減少
同義詞diminish
(名):The decrease in crime is accelerating.
犯罪案件正在加速地減少。
(動):Car sales are decreasing.
汽車銷售量下跌。

3893.dedicate(動)使效力于；奉獻
后接不定式to
I'd like to dedicate this book to my mother.
我謹以此書獻給我的母親。

3894.dedication(名)致力
He spent a life of dedication.
他奉獻了他的一生。

3895.deed(名)行為、功績
The team achieved new deeds of merit.
那一組又立了新功。

3896. deem(動)認為、視為
The board deemed it urgent that these files should be printed right away.
委員會認為這些檔案很緊急，應馬上印出來。

3897.defeat(動)打敗、擊敗
The instruction manual completely defeated me．
這操作指南把我完全弄糊涂了。

3898.defect(名)缺點
同義詞shortcoming
He thinks he has a lot of defect．
他認為他有很多缺點。

3899.defer(動)延期、順從
同義詞postpone
The department deferred the decision for six months.
這個部門延遲了六個月才做決定。

3900. define(動)解釋、給……下定義
We may define a square as a rectangle with four equal sides.
我們可以把正方形定義為四邊相等的矩形。

3901.definite(形)明確的、肯定的
There is a definite natationship between inflation and interest rates．
通貨膨脹和利率之間有明確的聯系。

3902.definitely(副)明確地
l definiteilt remember sending the letter.
我明確地記得發出這封信了。

3903.definition(名)定義
His artistry is beyond definition.
他高超的藝術才能是難以描述的。

3904.degree(名)程度；度數；位；等級
Her job demands a high degree of skill.
她的工作要求有高超的技能。

3905.delete(動)刪除
This command deletes files from the directory．
這一指令把檔案從目錄中刪除。