1.fortify v.增強營養(to impart physical strength or endurance to)

詞根記憶：fort(強大)+ify--使強大--增強營養

例：Many breakfast cereals are fortified with vitamin supplements.

同根詞：fortitude(n．剛毅)

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)

詞根記憶：foss(石頭)+il--變成了石頭--化石

例：fossil bones骨骼化石

派生詞:fossilize(v.使成化石，使陳腐)

3.fossilize v.（使）成為化石(to cause sth. to become a fossil)；（使）過時(to make sth. out of date)

詞根記憶：來自fossil(n.化石)

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

派生詞:fossilization(n.石化，僵化)

同根詞：fossiliferous (a．含有化石的)

4.foster v.養育，培養(to nurture)；加強，促進(to promote the growth or develop-ment of)

注意：bolster(讓支持)

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)；分數(an expression that indicates the quotient of two quantities)

詞根記憶：fract (破開)+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)；折斷(breaking)

詞根記憶：fract(破開)+ure--破開--折斷

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)

詞根記憶：frag=fract(破開)+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.

同根詞：fragment(n.碎片)

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

詞根記憶：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.誣陷(to contrive the evidence against( an innocent person) so that a verdict of guilty is assured)

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

同根詞：framework(n．框架，構架)