difficult/difficulty
difficult/ˈdifikəlt/adj.1.难的，困难的: It’s difficult for me to answer the question.对我来说回答那问题很难。Nothing is difficult to a man who wills.［谚］世上无难事，只怕有心人···
diffuse
diffuse/diˈfju:z/ I.vt.&vi.1.扩散，(使)弥漫：diffuse fragrant散布香味；diffuse light扩散光线2.传播，散布：diffuse knowledge传播知识；diffuse learning传播学问‖II.adj.1. (文章等···
dig
dig/dig/vt.(dug, dug) 1.掘，挖掘: dig the ground挖掘地面; dig a hole挖洞The truth was dug out.真相被挖出来了。2.用于短语动词：dig in开始用餐；决心干某事：The food’s on the table s···
digest/digestive
digestI. /daiˈdʒest/vt.&vi.消化：Some foods are hard to digest.有些食品不好消化。Mary can’t digest fat.玛丽不能消化(不吃)肥肉。Protein digests slowly.蛋白质消化慢。‖II. /ˈ···
digit/digital
digit/ˈdidʒit/n.［c］1.数字；位（数）：binary digit二进制数字；output digit输出数字The number 1999 contains four digits. 1999这个数目是四位数。2.手指；足指：He has six digits.他有···
dignity
dignity/ˈdiɡniti/n.［u］1.(举止，态度等的)庄严，端庄：the dignity of the lady女士的端庄2.尊贵，高贵：lose one’s dignity尊严丢失；the dignity of labour劳动的尊严
dilemma
dilemma/diˈlemə/n.［c］(进退两难的)窘境，困境：be in a dilemma在进退两难中；put one in a dilemma使人左右为难［考句］Doctors are often caught in a dilemma because they have to dec···
diligent
diligent/ˈdilidʒənt/adj.勤勉的，勤劳的：be diligent in one’s work工作努力After diligent searching, he found a parcel.在努力搜寻之后，他发现了一个小包。He made a diligent attemp···
dilute
dilute/daiˈlu:t/ I.vt.稀释，冲淡：dilute wine with water用水把酒冲淡He diluted the paint with oil.他添油把漆稀释。Bleach can be diluted with cold water.漂白剂可用冷水稀释。Dilute ···
