1.fault n.過錯(mistake)；【地】斷層(a fracture in the crust of a planet)

詞根記憶：fault本身為詞根：錯誤

例：Henyey found that temperatures in drill holes near the fault were not as elevated as had been suspected.

2.feasible a．可做的，可實行的(capable of being done or carried out)

詞根記憶：feas( =fac做)+ible--能做的--可實行的

例：Mass marketing remains the only economically feasible mode.

派生詞：feasibility(n.可行性)

3.fecundity n．多產（prolific）；繁殖力(fertility, productiveness)

詞根記憶：來自fecund(a．肥沃的)

例：A plant's fecundity decreases as the number of flowers produced by the plant decreases.

4.federal a.聯邦（制）的，聯邦政府的(of a system of government in which several states unite, usu. for foreign policy etc., but retain considerable control over their own internal affairs)

詞根記憶：feder(聯盟)+al一聯邦（制）的

例：Few manufacturers have taken advantage of the changes in the federal tax laws.

派生詞:federate(a．同盟的)；federation(門．同盟，聯邦)

5.feign v.假裝，偽裝(to make a false show of, to pretend)

例：The hognose snake puts on an impressive bluff, hissing and rearing back, broadens the flesh behind its head the way a cobra does, feigning repeated strikes, but, having no dangerous fangs and no venom.

6.feminist n．女權主義者(a person who supports that women should have the same rights and opportunities as men)

詞根記憶：femin（女人）+ist一女權主義者

例：western feminist theory西方女權說

同根詞：feminine(a.女性的)

7.ferrous a．含鐵的(containing iron)

詞根記憶：ferr(鐵)+ous--含鐵的

8.fertility n．繁殖力(the birthrate of a population)；豐產(the quality or state of being fertile)

詞根記憶：fer(帶，生)+tility--帶來新生命--繁殖力

例：fertiliity rates人口出生率//Venus is a goddess of fertdity and haNest.

同根詞：fertilizer(n.肥料)；fertilization（n．受孕，受精）

9.fettilized a．已受精的(being made fertile)

詞根記憶：來自fertilize(v.使受精)

例：fertilized eggs受精卵

10.fertilizer n．肥料，化肥(natural or artificial substance added to soil to make it more productive)

詞根記憶：來自fertilize(v.使肥沃)

例：Research has shown that Tanco could reprocess the by-product of potassium chloride use to yield a crop fertilizer. leaving a relatively small volume of waste for disposal.