4288.fragile(形)脆弱的、易碎的
同义词delicate
This old glass dish is very fragile.
这十个旧玻璃盘子是很容易破碎的。

4289.frail(形)虚弱的、脆弱的
Mother was becoming too frail to live alone.
母亲已逐渐衰弱到无法独居。

4290.frame(名)框架、架构
The bed has an iron frame.
床架是铁制的。

4291.framework(名)骨架
The report provides a framework for furfher research.
报告提供了进一步研究的原则。

4292.frank(形)坦白的
To be frank with you，I think your son has litthe chance of passing the exam．
坦白说，我认为你的儿子不大可能通过考试。

4293.frankly(副)坦白地、直率地
They frankly admitted their responsibility.
他们坦率地承担了责任。

4294.freeze(动)冷冻
不规则变化froze,frozen
It's so cold that even the river has frozer.
天气冷得河水都冷冻了。

4295.freezer(名)冰箱，冷冻柜
We keep frozon food in a freezer.
我们在冰箱里保存冷冻的食品。

4296.frequent(形)经常的
He is a frequent visitor to this country.
他常常参观这个国家。

4297.frequently(副)经常地
Buses run frequently between the city and the airport．
公车频繁地来往于市区与机场之间。

4298.freshman(名)新生、新鲜人
It's important for the college freshman to keep his nose clean.
对大学新生而言，洁身自爱是很重要的。

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年国际淡水年和论坛在同年举办，为二者相互宣传淡水问题和在这方面进行合作提供了机会。

4300.friction(名)摩擦、摩擦力
Friction between moving parts had caused the engine to over heat.
活动零件的摩擦使发动机过热。

4301.fright(名)惊吓
You gave me a fright jumping out at me like that.
你这样跳起来扑向我，把我吓了一跳。

4302.frighten(动)使惊吓、使害怕
同义词panic
He threatened the intruders with a gun and frightened them off.
他用枪威胁闯入者，把他们吓跑了。

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

4304.frown(动)皱眉；(名)皱眉：表示不满
(动):What are you frowning at me for?
你为什么朝我皱眉头？
(名):She looked up with a puzzled frown on her face．
她抬头望着，满脸困惑，双眉紧锁。

4305.frustrate(动)使受挫、使挫败
同义词foil
The lack of money and hands frustrated him.
缺乏资金和人手使他灰心。

4306.frustration(名)挫折
She couldn't stand the frustration of not being able to help.
眼睁睁看着却帮不上忙，她难以忍受这种挫折。

4307.frustrating(形)令人失望的
It's frustrating to have to wait so long.
要等这么长时间，真令人懊恼。

4308.fuel(动)给……加燃料
The helicopter was already fuelled and ready to go.
直升机已加好油,准备起飞。

4309.fulfill(动)实现
The company should be able to fulfill our requimrnents.
这公司应该能满足我们的需求。

4310.fulfillment(名)实现
I wish you success and fulfillment in the years ahead．
祝你事业成功，幸福美满，万事如意。

4311.full(形)充满的、满的、完全的
There were cardboard boxes stuffed full of clothes.
这里有塞满衣服的一个个纸箱。

4312.fully(副)完全地
We are fully aware of the dangers．
我们充分意识到危险。

4313.fume(动)冒烟、熏
Oak is fumed and than used to make furniture．
橡木在用来做家具时先被熏成深色。

4314.function(名)功能(动)运行
(名): What is his function on the committee?
他在委虽会的职务是什么？
(动):The machine will not function if you do not oil it well.
如果你不好好地加润滑油的话，这部机器就不会顺利运转。

4315.functional(形)功能的、起作用的
Bathrooms don't have to be purely functional.
浴室不必完全只为了实用。

4316.functionally(副)机能上
The two units are functionally interdependent.
这两个个体在机能上是相互依存的。

4317.fund(名)(动)资金
(名): The Social Security Retirement Program is made up of two trust funds,tha larger
of which could go penniless by next year.
社会退休保障专案由两个信托基金组成，其中比较大的一个到明年时资金将被耗尽。
(动): Privately funded resaarchers will respond positively to NBAC's appeal.
那些接受私人基金资助的研究人员将对NBAC的呼吁做出积极的回应。

4318.fundamental(形)基本的、基础的
同义词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)提供资金
不可数
There have been large cuts in government funding for scientific roseerch.
政府提供的科学研究资金已大幅度削减。