4971.motor(名)馬達、原動力
He startod the motor.
他啟動了發動機。

4972.mountainous(形)多山的
Taiwan is a mountainous regian．
臺灣是個多山的地方。

4973.movable(形)可移動的
Christmas is fixed,but Easter is a movable feast.
圣誕節的日期是固定的，但復活節的日期卻因年而異。

4974.mug(名)馬克杯
He drank a mug of coffee．
他喝了一大杯咖啡。

4975.murmur(動)喃喃自語、私語；發出輕柔持續的聲音
The wind murmured in the trees.
風在林中低鳴。

4976.muscle(名)肌肉；實力
The movement flexed black political muscles.
這場運動顯示了黑人的政治實力。

4977.muscular(形)肌肉的
He wished he was more muscular and didn't have such a flat chest.
他但愿自己更健壯些，胸部不會這么扁平。

4978.muse(動)沉思(名)繆斯女神；詩興
(動):I sat quietly, musing on the events of the day.
我靜靜地坐著，沉思一天中所發生的事。
(名):He felt that his muse had deserted him.
他覺得他已失去了創作靈感。

4979.museum(名)博物館
His works were hung in many museums.
他的作品被許多博物館收藏。

4980.musical(形)音樂的
She's very musical.
她極具音樂天賦。

4981.musician(名)音樂家
The conductor of the orchestra is a musician.
管弦樂隊的指揮是個音樂家。

4982.mute(形)啞的、沉默的(名)啞巴；靜音
(形): The child has been mute since birth.
那孩子生下來就是啞巴。
(名):He turned on the "mute" key of the TV in order to hear me clearly.
他把電視開到無聲以便聽到我的話。

4983.mutter(動)喃喃自語
We heard the man muttering something as he walked away.
我們聽到那人一邊走開一邊咕噥著什么。

4984.mutton(名)羊肉
The mutton was seasoned with garlic.
羊肉加了大蒜調味。

4985.mutual(形)相互的
We have a mutual agreement to help each other out when necessary．
我們彼此有協議，必要時要互相幫助渡過難關。

4986.myth(名)神話
when you are dealing myths,it is hard to be either proper，or scientific．
當你面臨神話般的吸引力時，你就很難做到合理或是與科學共存。

4987.nag(動)嘮叨、不斷地挑剔
She had been nagging him to paint the fence.
她一直嘮叨，要他把圍欄油漆一下。

4988.naive(形)天真的；質樸的、樸素的
I can't believe you were so naive as to trust him!
真是難以相信你會輕易信任他！

4989.naked(形)赤裸的
They often wandered around the house naked.
他們經常赤身裸體地在房子周圍謾步。

4990.napkin(名)餐巾
She folded the napkin into tha shape of a water lily.
她把餐巾折成百合的形狀。

4991.naval(形)海軍的
He is a retired naval officer.
他是一位退役的海軍軍官。

4992.Navy(名)海軍
N常大寫
The Navy is considering buying six new warships.
海軍正在考慮購買六艘新戰艦。

4993.nearsighted(形)近視的
Nearsighted people usually wear glasses．
患近視的人一般都戴眼鏡。

4994.necessarily(副)必要地
The number of places available is necessarily limited.
可用場所的數量不可避免地有限。

4995.necessary(形)必要的
同義詞essential
It doesn't seem necessary for us to meet.
我們似乎沒必要見面。

4996.necessitate(動)使成為必要
The increase in population necessitates a greater food supply.
人口的增加需要更多的食物供應。

4997.necessity(名)必要性；必需
Emphasis is laid on the necessity that all the objectives to be attained should be taken into account before starting a new plan．
要強調的是，在開始一項新的計劃之前，將要達到的所有目標都納入考量是必要的。

4998.negative(形)負面的、否定的
Most substances taken in excess will produce negative effects such as poisoning or intanse perceptual distortions.
大部分物質，一旦使用過量，就會產生負面影響，比如中毒或嚴重知覺扭曲。

4999.neglect(名)疏忽、忽視
同義詞overlook
The garden was in a state of total neglect.
那花園完全無人整理。

5000.negotiate(動)談判
The government will not negotiate with terrorists．
政府不會和恐怖分子談判。

5001.negotiation(名)談判
慣用復數
The rent is a matter for negotiation between the landlord and the tenant.
租金可以由房東和住戶協商確定。

5002.nephew(名)侄兒；外甥
The aunt went shopping with her two nephews.
阿姨帶著她的兩個侄子買東西去了。

5003.neutral(形)中立的
He remained neutral during the debate.
他在辯論中保持中立。

5004.navertheless(副)然而、仍然、不過
There is little chance that we will succeed in changing the law. Nevertheless,it is important that we try.
我們幾乎沒有可能改變法律。不過，重要的是我們要努力爭取。