factor

n.

any of the forces, conditions or influences that helps to produce a result 因素

Unit 1

fair

n.

a large-scale exhibition of commercial and industrial goods 商品展销会［trade fair 商品交易会］

Unit 2

fantastic

a.

excellent; marvelous 极好的

Unit 3

fashionable

a.

following a style that is currently popular 时兴的；流行的

Unit 3

fat

n.

white or yellow greasy substance found in animal bodies under the skin  脂肪

Unit 5

feasible

a.

able to be carried out or done; possible and reasonable 可行的［feasibility n. 可行性］

Unit 2

fiber

n.

any of the thin threads of which many animal and plant tissues are formed  纤维

Unit 5

figure

v.

(infl.  esp.  AmE) to consider; to estimate 揣测；相信

Unit 10

finance

v.

to work in the business of providing money 理财；融资

Unit 1

fingernail

n.

one of the hard flat pieces at the ends of the fingers 指甲

Unit 10

firmly

ad.

in a strong will 坚定地

Unit 3

fit

v.

to provide and put correctly into place 安装

Unit 2

footstep

n.

(the sound of) a person's step 脚步声；足迹

Unit 3

fulfil

v.

o do or perform (a duty, etc.) 履行（责任）

Unit 6

fulltime

a./ad.

for or during the whole of the working day or week 全日制的（地）；全日（的）地

Unit 3

fuss       

n.

unnecessary excitement, worry, impatience, etc.  often about something unimportant 大惊小怪

Unit 10