1.du, dub, doub=two, 二，双 dual dubious doubtful duplicate

　　2.duc, duct=lead, bring, 引导，带来ductile abduct deduce induce induct reduce viaduct

　　3.dur=last, hard, 持久，坚硬 durable duration endure indurate obdurate

　　4.dyn, dynam=power, 力量 dynamo adynamic

　　5.em, empt =take, procure, 拿，获得 exempt redeem peremptory preemptiveexemplify

　　6.equ, equi=equal, even, 相等，平均 equality equable equator equivalent equivocal

　　7.erg, ert=energy, work, 能量，活动 energy energetic synergic lethargic

　　8.err=wander, mistake, 漫游，犯错误errant erroneous erratic aberrant

　　9.ev=age, 年龄，时代 primeval medieval

　　10.fabl, fabul=speak, 讲，说 fable affable ineffable

　　11.fac, fic=face, 脸，面 facetious preface efface superficial

　　12.fac, fact, fect, fic, fig=make, do, 做，制作 facile facilitate benefactor benefaction

　　13.fall, fail, fault=err, deceive, 犯错误，欺骗 fallacy infallible falsify failure

　　14.fer=bring, carry, 带来，拿来 confer offer defer differ infer prefer refer

　　15.ferv=boil, 沸，热 fervent fervor effervescent

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