Discussion is an exchange of intelligence. Argument is an exchange of ignorance. 
讨论是交换智慧 .争辩是交换无知.

Diseases are the interests of pleasures. 
疾病是为享乐付出的债息．
 
Dispatch is the soul of business. 
迅速是商事之本.
 
Distrust all in whom the impulse to punish is powerful. 
不要信任任何有强烈惩罚欲的人. 

Do as you would be done by. 
己所不欲，勿施于人．  英语谚语 

Do business, but be not a slave to it. 
应为事之主,勿为事之奴. 

Do not all you can; spend not all you have; believe not all you hear; and tell not all you know. 
做事别逞能，用钱莫用尽，人言勿全信，说话留三分．
 
Do not buy what you want, but what you need; what you do not need is dear at a farthing. 
不要买你想要的,要买你需要的; 你不需要的东西哪怕一分钱也是贵的.
P.Cato 加图

Do not do to others what you would not have them do to you. 
己所不欲，勿施于人．  中国谚语 

Do not look each of you to your things, but each of you also to the things of others. 
不要只顾自己的事,也要顾别人的事.

Do not pick the sesame seeds but overlook the watermelons.
勿拣了芝麻，丢了西瓜．  中国谚语

Do not put all your eggs in one basket. 
不要把全部鸡蛋放在一只篮子里．
 
Do not put new wine into old bottles. 
不要旧瓶装新酒．

Do not try to live for ever. you will not succeed. 
不要幻想永远活下去,你不会成功的. 

Do not, for one repulse¹, forgo² the purpose that you resolved to effort. 
不要只因一次挫败,就放弃你原来决心想达到的目的. 
Shakespeare 莎士比亚 

Do what is right, come what may. 
不管会发生什么 ,对的就要去做. 

Do you know that those who run in a race run all, but only one receives the prize? Even so run, that you may attain³. 
岂不知在场上赛跑的都在跑，但得奖赏的只有一人 ? 即使如此，也只有这样跑，你们才有可能得到奖赏．
 
Don't be afraid of making mistakes, but it is harmful to let them remain uncorrected.  不怕有过，就怕不改．
 
Don't believe that winning is really everything. It's more important to stand for something. If you don't stand for something, what do you win? 
不要认为取胜就是一切 ,更重要的是要有信念,倘若你没有信念,那胜利又有什么意义呢?
Lane Kirkland 莱恩.柯克兰 

Don't carry coals to Newcastle. 
别往纽卡斯尔 (英煤都)运煤./多此一举，徒劳无益.  英语谚语

Don't count your chickens before they are hatched. 
蛋未孵，别先数鸡.
 
Don't deck yourself up with fine clothes, but enrich your mind with profound knowledge. 
不要用衣服装饰躯壳 ,而要用智慧丰富头脑. 

Don't expect anything original form an echo. 
不要期望从回声中找到独创的东西. 

Don't halloo till you are out of the wood. 
未出险境，莫先高兴.
 
Don't have too many irons in the fire. 
不要把太多的熨斗放到火炉上. /不要同时要办的事太多. 

Don't have your cloak to make when it begins to rain. 
别等下雨再做雨衣. /宜未雨绸缪. 

Don't make mountains out of molehills. 
勿把苍蝇说成大象.  英语谚语

Don't meet trouble half-way. 
不要自寻烦恼.