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IELTS BNC: 1245 COCA: 1390
*speed¹
/spi:d ||; spid/noun
1 [U] fast movement 迅速: I intend to start the race slowly and gradually pick up speed. 比赛开始时我打算慢慢跑，然后渐渐加快速度。 The bus was travelling at speed when it hit the wall. 公共汽车在快速行驶时撞在墙上。
2 [C,U] the rate at which sb/sth moves or travels 速度；速率: The car was travelling at a speed of 140 kilometres an hour. 汽车正以时速140公里行驶。 to travel at top/ high/ full/ maximum speed. 以全速╱高速╱全速╱最高速度行驶
speed²
/spi:d ||; spid/verb [I] (past tense past participle sped /sped ||; spɛd/)
1 to go or move very quickly 以高速前进或移动: He sped round the corner on his bicycle. 他骑自行车急速绕过拐角。
2 (only used in the continuous tenses 只用于进行时) to drive a car, etc faster than the legal speed limit 超速行车等: The police said she had been speeding. 警方说她超速行车。
speed (sth) up (past tense past participle speeded) to go or make sth go faster 加速；加快: The new computer system should speed up production in the factory. 新的计算机系统应该能加快工厂的生产。
IELTS BNC: 1245 COCA: 1390
speed1/spid; spiːd/ n 1 [C,U] how fast something moves〔物体移动的〕速度﹐速率: What speed were you travelling at ? 你当时的行驶速度是多少？at a speed of 30 mph/100 kph etc driving along at a speed of 60 mph 以每小时 60 英里的速度驾驶trains travelling at high speeds 高速行驶的火车We drove off at top speed (=as fast as possible). 我们以最快的速度驾驶而去。Motorists are being encouraged to reduce their speed . 请司机放慢速度。COLLOCATIONS 词语搭配at high/low speed 以高速/低速at great speed 以很高的速度at top/full speed 以最高速度/全速at lightning speed – extremely fast 以极快的速度﹐以闪电般的速度at breakneck speed – dangerously fast 以要命的速度at the speed of light 以光速2 [U] the rate at which something happens〔某事发生或进行的〕速度: +of the speed of change within the car industry 汽车工业内部的变革速度3 [U] the quality of being fast 快﹐快速: She acted with speed and efficiency. 她的行动干净利落。The train began to pick up speed (=gradually move faster). 火车开始加速。
speed2 v past tense and past participle sped /spɛd; sped/1 [I] to move quickly 迅速移动﹐快行: The bus sped along the motorway. 公共汽车在高速公路上疾驰。 2 be speeding to be driving faster than the legal limit 超速驾驶 —speeding n [U] speed up phr v past tense and past participle speeded 1 to move faster [ slow down ] 加速﹐增速 2 to happen more quickly, or to make something happen more quickly [ slow down ]（使）加快: speed sth up an attempt to speed up production at the factory 工厂加速生产的尝试
IELTS BNC: 1245 COCA: 1390
speed speedspeedsspedspeededspeeding2 verb (speeds, speeding, sped or speeded, has sped or has speeded)1to go or move very quickly: He sped past me on his bike.2to drive too fast: The police stopped me because I was speeding.speed up, speed something up to go faster; to make something go faster: What can we do to speed up the process?
speed speedspeeds1 nounhow fast something goes: The car was travelling at a speed of 50 miles an hour.a high-speed train (= that goes very fast)

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