D (来源：英语学习门户网站EnglishCN.com)

The darkest hour is nearest dawn. 黎明之前天最黑。

Day in and day out 日复一日

Dead Sea fruit 死海之果--华而不实

The death of wolves is the safety of sheep. 狼死羊安

Deeds are fruits; words are but leaves. 言语是叶，行为是果。

Deep rivers move in silence, shallow brooks are noisy. 河深水静流，溪浅水声喧

Deliberate slowly; execute promptly. 决策要慢，行动要快。

Despair gives courage to a coward. 人急造反，狗急跳墙。

Destroy the lion while he is yet but a whelp. 杀狮应在幼年时。

The devil takes the hindmost 迟者遭殃

diamond cut diamond 棋逢对手

die game 致死不屈

die hard 很难消除；死硬派

die in harness 战死杀场

The die is cast. 木已成舟

Diet cures more than doctors. 食疗胜于医疗

Diligence is the mother of success. 勤劳是成功之母

Diligence outstrips poverty. 勤能克穷

dine and wine 请酒席

dip into one's pocket 乱花钱

Discontent is the first step in progress. 不满足于现状是进步的开始。

Distrust is poison to friendship. 猜疑是友谊的毒药

Do as the Romans do. 入乡随俗

Do as you would be done by. 己所不欲，勿施于人

Don't cross the bridge until you come to it. 到了桥前才过桥

Don't trouble troubles until trouble troubles you. 麻烦不找你，不要找麻烦。

Dog does not eat dog. 同类不相残，同时不操戈

Don't count your chickens before they are hatched. 不要过早乐观

Dot one's I's and cross one's t's. 做收尾工作

Doubt is the key to knowledge. 多疑之人

down at the mouth 情绪低落

down and out 失败

drag one's feet 迟疑不前

draw a blank 落空；徒劳无功

draw the longbow 夸海口

drink like a fish 狂饮

drop in the ocean 沧海一粟

Drug on the market 卖不出的货物

Drowning man will catch at a straw. 溺水者见到稻草也要捞

Dumb dogs are dangerous. 不叫的狗咬人

Dutch courage 酒后之勇