spe,spec,spi=看
例子：auspice,aspect,respect,retrospect,conspicuous,despise,spectacle,speculate,suspect,prospect
dit,dic=说
例子：dedicate,vindicate,abdicate,addict,indicate,predict,predicate,dictate
firm,farm=牢固
例子：affirm,firm,farm,firmament,infirm,confirm
dis,di,de=分开，否定，缺乏
例子：disintegrate,diligent,dishonest,defer,different,dilapidated,decay,desperate,deter
ex,a=向外
例子：excavate,eject（前缀视为ex）,exclaim,escape（前缀视为ex）
cata=向下
例子：catalog,catastrophe,cataract,catalyst,cataclysm