1.framework n.框架 (a basic conceptional structure)

例： Relational feminism provides the best theoretical framework for contemporary feminist politics.

2.franchise n．特权(a special privilege granted to an individual or group)；经销权(a team and its operating organization having such membership)

例：We should not approve the business loan application of the local group that wants to open a franchise outlet for the Kool Kone chain of ice cream parlors.

同根词：enfranchise(让给予选举权)

3.fraternal a．兄弟的(of, relating to, or involving brothers)

词根记忆：fratern(兄弟)+al--兄弟的

例：fraternal twins异卵双生

4.frequency n. 频率 rate of occurrence or repetition of sth.)

词根记忆：来自 frequent( a.频繁的 )

例：Southern Airways has a far worse safety record than Air Dacentaria over the past few years, in terms of both the frequency of accidents and the severity of accidents.

5.friction n．摩擦(the rubbing of one body against another)

例：Under normal conditions, rocks composed of clay produce far less friction than other rocks do.

派生词：frictional(a．摩擦的)；frictionless(a．无摩擦的)

6.frontier n．国境(a border between two countries)；边缘地带(a region that forms the margin of settled or developed territory)

词根记忆：来自front(n．前方)

例：the North American frontier北美边境

7.frugal a．节约的，节俭的(sparing, thrifty, economical)

发音记忆：“腐乳过日”--吃腐乳过日子--节约的

例：Personal savings have been accumulated, often through frugal living habits.

派生词：frugality(n．节约，节俭)

8.frustrate v.挫败(to defeat)；（使）沮丧(to induce feelings of discouragement in)

例：The difficult exam frustrated the entire class.

派生词：frustration(n.沮丧，挫折)

9.fuel n．燃料(a material used to produce heat or power by burning)；v.给…加燃料(to provide worth fuel)；刺激(to stimulate)；推动(to support)

联想记忆：加满( fuel)燃料(fuel)

例：The use of coal as a fuel has declined from the level it was at in the previous twenty years.//The growth of the restaurant industry was fueled by recent social changes.

派生词：refuel(v．加油．加燃料)