teen, teens, thirteen, fourteen, fifteen, sixteen, seventeen, nineteen, umpteen

fourteenth

billionth, fourth, fifth, sixth, seventh

truth, berth, dearth, growth, health, illth, length, mirth, ruth

allotheism, ditheism, egotheism, henotheism, kathenotheism, monotheism, pantheism

action

episiotomy, lithotomy, lobotomy, necrotomy, tracheotomy

dominatrix, executrix

positron, cyclotron, ignitron

allotrope

dystrophy, heterotrophy, hypertrophy, oligotrophy, atrophy, trophic


finitude, magnitude, multitude, negritude


eighty, fifty, forty, ninety, thirty, twenty

safety, surety, propensity, uncertainty

四级一定行!


本部分内容看一遍就行,对于考试四级的人,不要在这里花费太多时间,因为很多词根在四级考试中跟本用不到,大学毕业后想继续深入学习英语的可以回来学习