1.fervent a.強烈的，熱烈的(passionate, zealous)

詞根記憶：ferv(熱)+ent一熱情的--熱烈的

注意：ferment(礦發酵)

例：The church members listened to their minister's fervent prayers.

派生詞：fervently( ad.熱烈地)

2.fetal a．胎兒的(of fetus)

詞根記憶：fet(胎兒)+al一胎兒的

注意：fatal(a．致命的)

例：Using a Doppler ultrasound device, feta/heartbeats can be detected.

同根詞：fetology(n.胎兒學)；feticide(n．墮胎)

3.fetch v.售得(to be sold for)

例：Individual bulls and cows received awards, fetched unprecedented prices, and excited enormous interest.

4.feudal a.封建制度的(of or according to the system during the Middle Ages in Europe, under which people receive land and protection from the landowner and work and fight for him in return)

詞根記憶：來自feud(n.封地)

例：feudal landholders封建地主

派生詞:feudalism(n.封建主義，封建制度)

5.fiber n.纖維(a thread or a structure or an object resembling a thread)

例：fier-optic cable光纖電纜

6.fibrosis n.纖維化(a condition marked by increase of interstitial fibrous tissue)

詞根記憶：來自fibre(n.纖維)

例：When lung tissue from people with cystic fibrosis is maintained in a solution with a normal satt concentration, the tissue can resist bacteria.

派生詞:fibrotic(a．纖維化的)

同根詞：fibroid(a．纖維性的;纖維狀的)

7.fickle a．易變的，不堅定的(unstable, unreliable)

詞根記憶：fic(做)+kle--做得不堅決--不堅定的

例：a fickle fortune多變的命運

8.fierce a．殘酷的(cruel)；兇猛的(violent)

詞根記憶：和force(礦強制，強迫)一起記

例：fierce competition殘酷的競爭//frerce struggle激烈的掙扎

派生詞：fiercely(ad.猛烈地;很)