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IELTS BNC: 1245 COCA: 1390
speednounuk/spiːd/ us/spiːd/

speed noun RATE OF MOVEMENT

B1 [ C or U ] how fast something moves速度，速率

He was travelling at a speed of 90 mph.他以每小时90英里的速度行进。
The car has a top speed of 155 miles per hour.这辆汽车的最高时速是155英里。
You should lower/reduce your speed as you approach a junction.接近交叉路口时应该放慢速度。
On a clear, straight road you can gather/pick up speed.在空旷笔直的公路上可以加速行驶。
He came off the road while driving his car round a bend at high/breakneck speed (= very fast).他在弯道上开得飞快，结果冲出了公路。
There are speed restrictions (= controls on how fast traffic is allowed to move) on this part of the road.这段路是限速的。
an electric drill with two speeds (= rates at which it turns)有两挡速度的电钻

B2 [ U ] very fast movement飞速，快速

I get a real thrill from speed.飞速驾车会让我兴奋不已。
He put on a sudden burst of speed.他突然加速了。
Both cars were travelling at speed (= very fast) when the accident happened.事故发生时两辆车的速度都很快。

[ U ] how fast something happens（事情发生的）速度，进度

We were surprised at the speed of the response to our enquiry.这么快就得到了答复，让我们很惊讶。
It was the speed at which it all happened that shocked me.令我感到震惊的是整个事情发生得如此之快。
She got through her work with speed (= quickly) and efficiency.她快速而高效地完成了她的工作。
the speed of light/sound

the rate at which light or sound travels光／音速

The speed of light is 300 million metres per second.光速是每秒钟3亿米。
These planes travel at twice the speed of sound.这些飞机以两倍音速飞行。

[ C ] a gear noun(ENGINE PART) 排挡，变速器

a bicycle with ten speeds有10挡速度的自行车
a ten-speed bicycle十速自行车

[ C ] the rate at which a photographic film absorbs or reacts to light（胶片的）感亮度

What speed film do I need for taking photographs indoors?我在室内拍照片需要感亮度为多少的胶卷？
shutter speed

the length of time for which part of a camera is open to allow light to reach the film when a photograph is being taken快门速度

a high/low shutter speed高／低快门速度

More examples

The hummingbird beats its wings at great speed.

With this drill it's possible to adjust the speed of rotation.

The engine shuts off automatically when the desired speed is reached.

Slack off your speed as you approach the corner.

The police car drove past at a terrific speed.

speed noun DRUG

[ U ] slang foramphetamine (= a drug that makes the mind or body more active)苯丙胺，安非他明（一种兴奋剂）

She was on speed at the time.她当时服了安非他明。

Idiom(s)

up to speed
speedverb [ I or T, usually + adv/prep ]uk/spiːd/ us/spiːd/ sped or speeded, sped or speeded

to (cause to) move, go, or happen fast（使）快速移动；（使）快速前行；加速；促进

The train sped along at over 120 miles per hour.火车以每小时120多英里的速度飞驰。
The actress then sped away/off in a waiting car.后来女演员钻进了一辆等候的汽车，迅速离开了。
We sped down the ski slopes.我们飞速滑下滑雪坡。
This year is speeding by/past.这一年过得特别快。
Ambulances sped the injured people (= moved them quickly) away from the scene.救护车载着伤员飞速驶离现场。
The best thing you can do to speed your recovery (= make it quicker) is to rest.尽快让身体康复的最佳方法就是休息。
be speeding

to be driving faster than you are legally allowed to do违法超速行驶

He was caught speeding.他超速行驶被抓住了。

More examples

O'er land and sea they sped.

The car pulled off and sped up the road.

The train sped through the station with a whoosh.

We are trying to speed investment in the area.

Four boys on motorbikes came speeding down the road.

Phrasal verb(s)

speed (sth) up
IELTS BNC: 1245 COCA: 1390
speed

noun

ADJECTIVE | ... OF SPEED | VERB + SPEED | SPEED + VERB | SPEED + NOUN | PREPOSITION | PHRASES ADJECTIVE➤amazing, astonishing, breakneck, fast, good, great, high, incredible, lightning, phenomenal, remarkable, startling, surprising, terrific (especially BrE) 驚人的速度；非常危險的速度；快速；高速；令人難以置信的速度；閃電般的速度◇The new houses have been built with astonishing speed.這些新房子修建的速度快得驚人。◇He drove us to the hospital at breakneck speed.他以驚險的速度開車送我們去醫院。➤low, slow低速；慢速▸➤full, maximum, top, warp (informal, humorous, especially NAmE) 全速；最高速度；極速；超乎尋常的速度◇Business is moving at warp speed.貿易正以超乎尋常的速度推進。➤excess超速◇90% of car accidents involve excess speed.90% 的車禍與超速駕駛有關。➤constant, steady恆定的／平穩的速度▸➤average, normal平均／正常速度➤increased加快的速度➤operating, processing, processor, running運轉／處理／處理器／運行速度◇the increase in processor speeds for home computers家用計算機處理器速度的提升◇The machinery is regulated to a safe running speed.這台機器調到了安全的運行速度。➤broadband, connection, download寬帶／鏈接／下載速度◇We offer subscribers a download speed of 8 MB.我們為用戶提供 8 兆字節的下載速度。➤cruising, flying巡航／飛行速度➤supersonic超音速◇jets flying at supersonic speed超音速噴氣式飛機➤traffic (especially BrE) , etc.車流等速度▸➤air, wind風速➤engine發動機轉速➤shutter快門速度◇The camera will choose a fast shutter speed.照相機將選擇較快的快門速度。... OF SPEED➤burst一陣速度的爆發◇The Kenyan runner put on a sudden burst of speed over the last 50 yards.肯尼亞運動員在最後 50 碼突然加速。➤rate (NAmE) 速率◇He was traveling at a high rate of speed.他正以高速行駛。VERB + SPEED➤attain, reach到達⋯的速度◇The car reaches a speed of 60 miles per hour within five seconds.這款車能在 5 秒鐘之內提速到每小時 60 英里。➤build up, gain, gather, increase, pick up加速；提速◇The train pulled out of the station, slowly gathering speed.火車駛出車站，慢慢開始加速。➤lose失速▸➤kill, reduce減速；降速◇Motorists are asked to reduce their speed in wet conditions.要求駕駛員雨天行車要減慢速度。➤maintain保持速度◇The boat maintained a steady speed while the sea was calm.大海風平浪靜的時候，船保持平穩的速度。➤move at, run at, travel at以⋯速度移動／行駛／行進◇The glacier moves at an average speed of about six feet per day.冰川以平均每天 6 英尺的速度移動。◇Radio waves travel at the speed of light.無線電波以光速傳播。➤measure測量速度SPEED + VERB➤increase加速▸➤decrease減速SPEED + NOUN➤control, reduction, restriction (especially BrE) 速度控制；減速；限速▸➤record速度紀錄◇He set a new land speed record in this car.他開這輛車創了陸地行駛速度的新紀錄。➤bump, hump (BrE) 減速帶▸➤camera, trap超速行車監視攝像機；汽車超速監視區PREPOSITION➤at speed (= fast) 高速地◇The car was moving at speed when the accident happened.事故發生時，這輛車正高速行駛。◇at lightning speed以閃電般的速度➤in speed在速度上◇a significant increase in speed速度的顯著提高➤with speed以⋯速度◇Hedgehogs, though small, can move with surprising speed.刺猬儘管很小，但動起來速度驚人。➤speed of⋯速度◇The ships have a maximum speed of 18 knots.這些船的最快速度是 18 節。PHRASES➤at full speed, full speed以最快速度；全速◇He was running at full speed when a tendon snapped in his leg.他正全速奔跑時，腿部的一條肌腱斷裂了。➤full speed ahead全速前行◇The boat can be brought to a stop from full speed ahead within her own length.這艘船可以在一個船身的距離內從全速航行中停下來。➤the speed of light, the speed of sound光速；聲速◇Concorde crossed the Atlantic at twice the speed of sound.協和飛機以兩倍聲速飛越大西洋。➤a turn of speed (BrE) 緊急加速（性能）◇For a small car it has a good turn of speed.對小型轎車來說，這輛車的緊急加速性能挺不錯。
IELTS BNC: 1245 COCA: 1390
speed noun
⇨ speed (excessive speed) ⇨ rate 1 (at top speed)speed verb
⇨ accelerate (speed the development of sth) ⇨ fly 2 (He sped away on his bike.) speed

noun

speed ♦︎ velocity ♦︎ haste ♦︎ rapidityThese are all words that can be used when sth happens, travels or is done very quickly. 这些词均表示快速、迅速。PATTERNS AND COLLOCATIONS 句型和搭配◆increasing speed / velocity / rapidity◆great speed / haste / rapidity◆maximum / constant speed / velocity◆reckless speed / haste◆alarming / amazing / bewildering / remarkable speed / rapidity◆to measure speed / velocity■ speed [uncountable] the quality of being quick or happening quickly 快；迅速◆The accident was due to excessive speed.那次事故的原因是速度过快。◆She was overtaken by the speed of events (= things happened more quickly than she expected).事态发展之快是她始料不及的。◆ (formal) The car flashed past them at speed.那汽车从他们身边疾驰而过。  see also speed ⇨ rate 1 , speedy ⇨ quick ■ velocity vəˈlɒsəti; NAmE vəˈlɑːsəti [uncountable, countable] (technical 术语 or formal) the speed of sth in a particular direction; high speed （沿某一方向的）速度；高速；快速◆to gain / lose velocity加速；减速◆Light travels at a constant velocity.光以恒定速度传播。◆Jaguars can move with an astonishing velocity.美洲豹跑起来速度惊人。■ haste [uncountable] (formal) speed in doing sth, especially because you do not have enough time 急速；匆忙；仓促◆In her haste to finish on time she made a number of mistakes.她急急忙忙想按时完工，结果出了一些错误。◆The letter had clearly been written in haste.这封信显然是仓促写就的。  see also hasten ⇨ hurry , hasty ⇨ quick ■ rapidity rəˈpɪdəti [uncountable] the fact of happening or changing very quickly or in a short period of time 快速；高速◆These changes happen with extreme rapidity.这些变化是以极快的速度发生的。  see also rapid ⇨ quick
IELTS BNC: 1245 COCA: 1390

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