首页英语词典jamjam的意思

jam

英 [dʒæm] 美[dʒæm]

英英释义同义词辨析词组搭配考试真题实用场景例句

近义词crush push load stuff heap press cram crowd jelly

n. 果酱；拥挤；困境；扣篮
vt. 使堵塞；挤进，使塞满；混杂；压碎
vi. 堵塞；轧住
n. (Jam)人名；(伊朗、巴基)贾姆

核心词汇中低频词CET6考研IELTSTEM4CET4

词态变化

复数: jams;第三人称单数: jams;过去式: jammed;过去分词: jammed;现在分词: jamming;

助记提示

1. MM 的家塞满果酱.
2. jam谐音“酱”

中文词源

jam 果酱，堵塞，塞车

词源不详，可能来自cram变体，塞进，强塞，引申词义堵塞，塞车。果酱义可能来自同一词源，即把水果压碎制成果酱。

英英释意

1. preserve of crushed fruit

2. informal terms for a difficult situation;: "he got into a terrible fix"; "he made a muddle of his marriage"

3. a dense crowd of people

4. deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems

英文词源

jam: jam: [18] The verb jam, meaning ‘press tightly together’, first appears in the early 18th century (the earliest-known unequivocal example of its transitive use is in Daniel Defoe’s Robinson Crusoe 1719: ‘The ship stuck fast, jaum’d in between two rocks’). It is not known where it came from, but it is generally assumed to be imitative or symbolic in some way of the effort of pushing.

Equally mysterious are the origins of jam the sweet substance spread on bread, which appeared around the same time. Contemporary etymologists were nonplussed (Nathan Bailey had a stab in the 1730s: ‘prob. of J’aime, i.e. I love it; as Children used to say in French formerly, when they liked any Thing’; but Dr Johnson in 1755 confessed ‘I know not whence derived’); and even today the best guess that can be made is that the word refers to the ‘jamming’ or crushing of fruit into jars.
jam (v.): "to press tightly," also "to become wedged," 1706, of unknown origin, perhaps a variant of champ (v.). Of a malfunction in the moving parts of machinery, by 1851. Sense of "cause interference in radio signals" is from 1914. Related: Jammed; jamming. The adverb is recorded from 1825, from the verb.
jam (n.1): "fruit preserve," 1730s, probably a special use of jam (v.) with a sense of "crush fruit into a preserve."
jam (n.2): "a tight pressing between two surfaces," 1806, from jam (v.). Jazz meaning "short, free improvised passage performed by the whole band" dates from 1929, and yielded jam session (1933); but this is perhaps from jam (n.1) in sense of "something sweet, something excellent." Sense of "machine blockage" is from 1890, which probably led to the colloquial meaning "predicament, tight spot," first recorded 1914.

同义词辨析

press, jam, squeeze, compress, squash

这些动词均含"压，挤"之意。

press：普通用词，指一个物体在另一个物体上加压力。

jam：专指四面八方都压紧或塞满。

squeeze：多指从两面或多面施加压力来压紧、压碎或压出水来。

compress：指把某些东西压在一起或使占有较小空间。

squash：指某物受力被压偏或压碎。也指塞挤。

考试真题

Wireless security providers will often take steps to help combat the threat of jamming attacks.

When the system thinks it's being jammed, it'll notify you via -94- push alert ( ' , 推送警报).

Then, he's going to need to know the technical details of your system and acquire the specific equipment necessary for jamming your specific setup.

The team at Frontpoint addresses the issue in a blog on its site, citing their own jam protection software and claiming that there aren't any documented cases of successful jam attack since the company began offering wireless security sensors in the 1980s.

That approach will eliminate most cord-cutting concerns—but what about their wireless equivalent, jamming? With the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?Jamming concerns are nothing new, and they're not unique to security systems.

So, too, would the motion detectors in your home, so the thief will need to continue jamming once he's inside and searching for things to steal.

SimpliSafe, winner of our Editor's Choice distinction, utilizes a special system that's capable of separating incidental RF interference from targeted jamming attacks.

SimpliSafe was singled out in one recent article on jamming, complete with a video showing the entire system being effectively bypassed with handheld jamming equipment.

SimpliSafe provides devices that are able to distinguish incidental radio interference from targeted jamming attacks.

Other systems also seem confident on the subject of jamming.

Jamming attacks are absolutely possible.

It's easier to find and acquire jamming equipment for some frequencies than it is for others.

It is possible for burglars to make jamming attacks with the necessary equipment and skill.

He'll need to be jamming you at this point, as a broken window or opened door would normally release the alarm.

For comparison, let's say you wanted to jam a conversation between two people—all you'd need to do is yell in the listener's ear.

But how probable is it that someone will successfully jam their way into your home and steal your stuff?Let's imagine that you live in a small home with a wireless security setup that offers a functional anti-jamming system.

As said before, with the right equipment and the right know-how, it's possible to jam any wireless transmission.

A burglar has to continuously jam the wireless security device to avoid triggering the alarm, both inside and outside the house.

To prevent possible traffic jams in nearby areas.

Jane may be caught in a traffic jam.

But how probable is it that someone will successfully jam their way into your home and steal your stuff?

For comparison, let's say you wanted to "jam" a conversation between two people—all you'd need to do is yell in the listener's ear.

The team at Frontpoint addresses the issue in a blog on its site, citing their own jam protection software and claiming that there aren't any documented cases of successful jam attack since the company began offering wireless security sensors in the 1980s

Traffic jam leads to expense and unpredictability, things that keep investors away.

The music service This Is My Jam helps people navigate the tens of millions of tracks now available instantly via Spotify and iTunes.

The service was only launched this year, but by the end of September 650,000 jams had been chosen.

Hundreds of fans jammed the airport to greet them.

There is a traffic jam on king street.

词组搭配

jam on the brakes

operate the brakes of a vehicle suddenly and forcibly, typically in response to an emergency

紧急刹车

jam tomorrow

(Brit.)a pleasant thing which is often promised but rarely materializes

(英)允诺而做不到的好事；可望而不可即的事物

a promise of jam tomorrow wasn't enough to satisfy them.
口惠而实不至的诺言难以令他们满意。

实用场景例句

(British English)a jam doughnut: 果酱炸面圈

strawberry jam: 草莓酱

recipes for jams and preserves: 果酱和蜜饯的制作方法

The bus was delayed in a five-mile jam.: 公共汽车因长达五英里的交通堵塞而延误。

As fans rushed to leave, jams formed at all the exits.: 因球迷都急于离开，所有出口都给阻塞了。

There's a paper jam in the photocopier.: 复印机卡纸了。

They refused to settle for a promise of jam tomorrow.: 他们并不满足于那些美好未来的空话。

He jammed his fingers in his ears.: 他用手指使劲堵住耳朵。

A stool had been jammed against the door.: 门被一个凳子顶住了。

The photocopier keeps jamming up.: 这复印机总是卡纸。

There's a loose part that keeps jamming the mechanism.: 有个零件松了经常卡住机器。

The valve has jammed shut.: 阀门给卡住了打不开。

He jammed the door open with a piece of wood.: 他用一块木头卡住门让它开着。

Six of us were jammed into one small car.: 我们六个人被塞进一辆小汽车里。

We were jammed together like sardines in a can.: 我们像罐头里的沙丁鱼一般紧紧挤在一起。

The cupboards were jammed full of old newspapers.: 橱柜里塞满了旧报纸。

Nearly 1 000 students jammed into the hall.: 近1 000名学生挤到礼堂里。

...home-made jam.: 自制果酱

He picked his cap up off the ground and jammed it on his head...: 他从地上捡起帽子，猛地扣到头上。

Pete jammed his hands into his pockets.: 皮特使劲把手插进口袋里。

The second time he fired his gun jammed...: 他开第二枪时枪卡壳了。

A rope jammed the boat's propeller...: 一根绳子卡住了船的螺旋桨。

Hundreds of departing motorists jammed the roads.: 数百名打算驾车离开的司机堵住了道路。

Hundreds of people jammed the boardwalk to watch...: 数百人挤在木板人行道上观看。

They jammed into buses provided by the Red Cross and headed for safety.: 他们挤上红十字会派来的巴士前往安全的地方。

They will try to jam the transmissions electronically.: 他们会试图用电子信号对发射进行干扰。

Hundreds of callers jammed the BBC switchboard for more than an hour...: 在一个多小时内，成百上千的来电使得英国广播公司的总机应接不暇。

The telephone exchange has been jammed all day with people wanting to buy season tickets.: 很多人想买季票，电话总机一天到晚忙个不停。

They were in a real jam, Bob thought glumly.: 他们确实遇上麻烦了，鲍勃闷闷不乐地想。

He was jamming with his saxophone.: 他在即兴吹奏萨克斯管。

jam

词态变化

助记提示

中文词源

英英释意

英文词源

同义词辨析

考试真题

词组搭配

jam on the brakes

jam tomorrow

实用场景例句

考试词汇

频率词汇

分类词汇

单词首字母

汉语字典查询

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