4288.fragile(形)脆弱的、易碎的
同義詞delicate
This old glass dish is very fragile.
這十個舊玻璃盤子是很容易破碎的。

4289.frail(形)虛弱的、脆弱的
Mother was becoming too frail to live alone.
母親已逐漸衰弱到無法獨居。

4290.frame(名)框架、架構(gòu)
The bed has an iron frame.
床架是鐵制的。

4291.framework(名)骨架
The report provides a framework for furfher research.
報告提供了進一步研究的原則。

4292.frank(形)坦白的
To be frank with you，I think your son has litthe chance of passing the exam．
坦白說，我認(rèn)為你的兒子不大可能通過考試。

4293.frankly(副)坦白地、直率地
They frankly admitted their responsibility.
他們坦率地承擔(dān)了責(zé)任。

4294.freeze(動)冷凍
不規(guī)則變化froze,frozen
It's so cold that even the river has frozer.
天氣冷得河水都冷凍了。

4295.freezer(名)冰箱，冷凍柜
We keep frozon food in a freezer.
我們在冰箱里保存冷凍的食品。

4296.frequent(形)經(jīng)常的
He is a frequent visitor to this country.
他常常參觀這個國家。

4297.frequently(副)經(jīng)常地
Buses run frequently between the city and the airport．
公車頻繁地來往于市區(qū)與機場之間。

4298.freshman(名)新生、新鮮人
It's important for the college freshman to keep his nose clean.
對大學(xué)新生而言，潔身自愛是很重要的。

4299.freshwater(形)淡水的
The coincrdence of the International Year of Freshwater,2003 with the Forum provides an opportunity for reciprocaJ promotion of andcooparation on freshwater issues．
2003年國際淡水年和論壇在同年舉辦，為二者相互宣傳淡水問題和在這方面進行合作提供了機會。

4300.friction(名)摩擦、摩擦力
Friction between moving parts had caused the engine to over heat.
活動零件的摩擦使發(fā)動機過熱。

4301.fright(名)驚嚇
You gave me a fright jumping out at me like that.
你這樣跳起來撲向我，把我嚇了一跳。

4302.frighten(動)使驚嚇、使害怕
同義詞panic
He threatened the intruders with a gun and frightened them off.
他用槍威脅闖入者，把他們嚇跑了。

4303.frost(名)霜
It will be a clear night with some ground frost.
今夜晴，部分地面有霜凍。

4304.frown(動)皺眉；(名)皺眉：表示不滿
(動):What are you frowning at me for?
你為什么朝我皺眉頭？
(名):She looked up with a puzzled frown on her face．
她抬頭望著，滿臉困惑，雙眉緊鎖。

4305.frustrate(動)使受挫、使挫敗
同義詞foil
The lack of money and hands frustrated him.
缺乏資金和人手使他灰心。

4306.frustration(名)挫折
She couldn't stand the frustration of not being able to help.
眼睜睜看著卻幫不上忙，她難以忍受這種挫折。

4307.frustrating(形)令人失望的
It's frustrating to have to wait so long.
要等這么長時間，真令人懊惱。

4308.fuel(動)給……加燃料
The helicopter was already fuelled and ready to go.
直升機已加好油,準(zhǔn)備起飛。

4309.fulfill(動)實現(xiàn)
The company should be able to fulfill our requimrnents.
這公司應(yīng)該能滿足我們的需求。

4310.fulfillment(名)實現(xiàn)
I wish you success and fulfillment in the years ahead．
祝你事業(yè)成功，幸福美滿，萬事如意。

4311.full(形)充滿的、滿的、完全的
There were cardboard boxes stuffed full of clothes.
這里有塞滿衣服的一個個紙箱。

4312.fully(副)完全地
We are fully aware of the dangers．
我們充分意識到危險。

4313.fume(動)冒煙、熏
Oak is fumed and than used to make furniture．
橡木在用來做家具時先被熏成深色。

4314.function(名)功能(動)運行
(名): What is his function on the committee?
他在委雖會的職務(wù)是什么？
(動):The machine will not function if you do not oil it well.
如果你不好好地加潤滑油的話，這部機器就不會順利運轉(zhuǎn)。

4315.functional(形)功能的、起作用的
Bathrooms don't have to be purely functional.
浴室不必完全只為了實用。

4316.functionally(副)機能上
The two units are functionally interdependent.
這兩個個體在機能上是相互依存的。

4317.fund(名)(動)資金
(名): The Social Security Retirement Program is made up of two trust funds,tha larger
of which could go penniless by next year.
社會退休保障專案由兩個信托基金組成，其中比較大的一個到明年時資金將被耗盡。
(動): Privately funded resaarchers will respond positively to NBAC's appeal.
那些接受私人基金資助的研究人員將對NBAC的呼吁做出積極的回應(yīng)。

4318.fundamental(形)基本的、基礎(chǔ)的
同義詞essential
There are fundamental differences between your rerligious beliefs and mine.
你我的宗教信仰根本不同。

4319.funding(名)提供資金
不可數(shù)
There have been large cuts in government funding for scientific roseerch.
政府提供的科學(xué)研究資金已大幅度削減。