1.fortify v.增强营养(to impart physical strength or endurance to)

词根记忆：fort(强大)+ify--使强大--增强营养

例：Many breakfast cereals are fortified with vitamin supplements.

同根词：fortitude(n．刚毅)

2.fossil n.化石(a remnant, impression, or trace of an organism of past geologic ages that has been preserved in the earth's crust)

词根记忆：foss(石头)+il--变成了石头--化石

例：fossil bones骨骼化石

派生词:fossilize(v.使成化石，使陈腐)

3.fossilize v.（使）成为化石(to cause sth. to become a fossil)；（使）过时(to make sth. out of date)

词根记忆：来自fossil(n.化石)

例：The four-million-year-old fossilized skeleton known as Lucy is so small compared with many other skeletons.

派生词:fossilization(n.石化，僵化)

同根词：fossiliferous (a．含有化石的)

4.foster v.养育，培养(to nurture)；加强，促进(to promote the growth or develop-ment of)

注意：bolster(让支持)

例：The regional developments will foster integration in the two largest and richest markets of the world.

5.fraction n．片段(fragment)；小部分(portion)；分数(an expression that indicates the quotient of two quantities)

词根记忆：fract (破开)+ion--片段

例：Parking charges here are $0.75 for the first hour and $0.50 for each additional hour or fraction of an hour.

6.fracture n.骨折( the breaking of bone)；折断(breaking)

词根记忆：fract(破开)+ure--破开--折断

例：The healing of ankle fractures is always checked by means of a follow-up x-ray.

7.fragile a．脆的，易碎的( easily broken)；脆弱的(delicate)

词根记忆：frag=fract(破开)+ile(易…的)--易碎的

例：Coral reefs(珊瑚礁)are one of the most fragile, biologically complex , and diverse marine ecosystems on earth.

同根词：fragment(n.碎片)

8.fragment n.碎片(a broken piece)；部分(a part)

词根记忆：frag(破碎)+ment--碎片

例：The bone fragments were joined together to form the complete skeleton of the animal.

9.frame n.框架( border of wood, metal, etc. in which a picture, door, pane of glass, etc. is enclosed or set);v.诬陷(to contrive the evidence against( an innocent person) so that a verdict of guilty is assured)

例：picture frame相框//time frame时限//Framed by traitorous colleagues ,Alfred was imprisoned for twelve years.

同根词：framework(n．框架，构架)