in all directions 四麵八方；到處
director /n. ［C］導演；主任：His father is a film director. 他的父親是個電影導演。/He is the director of the art center. 他是那個藝術中心的主任。
dirty［E］/-adj. 髒的：The water is too dirty to drink. 水太髒不能喝。/Don't say dirty words. 不要說髒話。
discover /v. 發現：Man discovered the use of fire long time ago. 人類很早以前就發現了火的用途。/He discovered that he was out of money. 他發現他沒有錢了。
discovery /n. ［U］［C］發現：The discovery of oil on their land made the people rapidly rich. 他們土地上石油的發現使人們迅速富起來。/Some discoveries were made by chance. 一些發現是偶然得到的。
discuss /v. 討論：They often discuss their homework together. 他們常常在一起討論作業。/We are discussing what we are going to do and how to do it. 我們正在討論準備做什麼，怎麼做。/Who are you going to discuss your problem with? 你打算同誰討論你的問題？
discussion /n. ［U］［C］討論：We can learn more from discussion. 我們從討論中可以學到更多。/They are having a discussion about the problem of air pollution. 他們正在討論空氣汙染問題。
dish /n. ［C］盤子；餐具；菜肴：He put an egg and some meat on his dish. 他在盤子上放了一隻雞蛋和一些肉。/Who washes the dishes after dinner? 誰飯後洗餐具？/There are different kinds of dishes on the menu. 菜單上有不同類型的菜肴。
divide /v. 把…隔開；分（成）；用…除（以）：A river divides the two villages. 一條河把兩個村子隔開。/How many parts can this text be divided into? 這篇課文可以分成幾個部分？/When you divide 8 by 2，you get 4. 用8除以2得4。
do［E］/ （does /; did/，done /） aux. v. 用於構成疑問句與否定句；用於動詞的重複；（用於強調動詞）確實；-v. 做；過得；可以：Do you like playing computer games? 你喜歡玩計算機遊戲嗎？/He does not swim a lot in summer. 他夏天不常遊泳。/“Does your father smoke?” “Yes，he does.”“你爸爸抽煙嗎？”“是的，他抽煙。”/I did come to school yesterday. 我昨天確實上學了。/“What did you do yesterday?” “I did some reading.”“你昨天做什麼了？”“我做了一些閱讀。”/“How are you doing these days?” “I'm doing well.”“你最近過得怎麼樣？”“我過得很好。”/There is not much food，but it will do for us. 食物不多，但對我們來說可以。
doctor［E］/n. ［C］醫生；博士：When we are ill，we go to see a doctor. 我們生病時去看醫生。/Our teacher is a doctor of education. 我們的老師是教育博士。
dog［E］/n. ［C］狗：Dogs are man's good friends. 狗是人類的好朋友。
dollar /n. ［C］元（美、加、澳、新西蘭等國貨幣單位，符號為）：Give him a dollar. 給他一元錢。
door［E］/n. ［C］門；門口：Open the door，please. 請開門。/He was waiting at the door. 他在門口等。
from door to door 挨家挨戶/next door 隔壁/out of doors 在戶外
double /adj. 雙的；雙人的；雙倍的；雙重的；-v. （使）增加一倍；雙寫：A single room costs 40 a night，and a double room costs 60 in this hotel. 這個旅館裏單人房間要價40美元，雙人房間要價60美元。/There is a double bed in the room. 房間裏有一張雙人床。/People who work in holidays will get double pays. 節假日上班的人會得到雙倍工資。/People sometimes may use double standards to look at things. 人們有時會用雙重標準看待事情。/The price of the vegetables has been doubled because of bad weather. 因為天氣不好，蔬菜價格上漲了一倍。/The population of the city will double soon. 這個城市的人口會很快增加一倍。/The letter “s” is doubled in the word “necessary”. 字母s在necessary一詞中是雙寫的。
doubt /v. 懷疑；不確定；-n. ［U］［C］懷疑；疑問；疑慮：They doubt if the plan can be successful. 他們懷疑這個計劃是否能成功。/I doubt that she will come. 我不確定她會來。/I have no doubt that this is a new car. 我毫不懷疑這是輛新車。/There is no doubt about our success in this program. 毫無疑問我們在這個項目上會成功。/Do you have any doubts? 你還有任何疑慮嗎？
beyond doubt 毫無疑問/no doubt 肯定；確實
down［E］/prep. 下；沿著；-adv. 倒；下；那邊；朝南：We walk down the steps. 我們走下台階。/They ran down the street. 他們沿著街道跑去。/The little girl fell down. 小女孩摔倒了。/Drink this down and it will do you good. 喝下這個，對你有好處。/They went down to the park after dinner. 飯後他們去了公園那邊。/You can walk down to a crossroad and then turn left. 你可以朝南走到一個十字路口，然後左轉。