dissuade [dis- = apart 离；suade = to urge 力劝=>“to urge sb. apart力劝某人离开” →]vt. persuade not to do sth.劝止，劝阻 / The father finally dissuaded his son from leaving school.父亲终止劝阻了儿子的中途辍学的想法。

dissuasion n. 劝阻 

dissuasive a. 劝阻的

distract [ dis- = apart 开;tract = to draw 牵引→] vt. draw apart (the mind or attention)引开(心思)，分散(注意力)，使分心/ Noise distracts my attention from studying.吵闹声使我无法专 心学习。

distraction n. 精神换散；心烦意乱 

distractive a. 使人分心的

接着，再看一看dif-和di-能与何种首字母的词根相缀合。

differ [ dif- (dis-) = apart 开；fer = to carry 拿=> “to carry apart from each other 拿开；互相分离 ”→]v. be unlike; disagree 不同，相异 / My answer to the arithmatic problem differs from hers.我得出的这道算术题的答案和她的不一样。

difference n. 不同；差异 

different a. 不同的；有差异的

diffuse [dif- (dis-) = apart 开；fus= to pour 倾倒；-e=>“to pour apart in every direction 向四面八方洒开”→]vt. scatter widely 使散开，使扩散/ The sun diffuses light and heat.太阳散发出光和热。

diffusion n. 散幵，扩散 

diffusive a. 散开的，扩散的

dilate [di- (dis-) = apart 开；lat = to widen 加宽；-e=>“to widen apart 加宽开来”→]vt. expand; enlarge 膨胀；扩大 / When you take a deep breath, you dilate your nostrils.当你深呼吸时，鼻孔就扩张了。

dilation n. 膨胀；扩大 

dilative a. 引起膨胀的；膨胀的