speed 1 S2 W1 / spid / 名词
1 of movement [可数和不可数名词] the rate at which something moves or travels :
The truck was travelling at a speed of 50 mph.
particles that travel at the speed of light.
Register
In everyday English, people usually talk about how fast something or someone is rather than using the 名词 peed : What speed was he going? ➔ How fast was he going?
2 of action [可数和不可数名词] the rate at which something happens or is done
speed of
the speed of change within the industry
a high-speed computer
The population was growing at great speed.
3 fast [不可数名词] the quality of being fast :
The women’s basketball team has talent, speed, and power.
with speed
She acted with speed and efficiency.
at speed British English :
a van travelling at speed
4 photography [可数名词]
a) the degree to which photographic film is sensitive to light
b) the time it takes for a camera shutter to open and close :
a shutter speed of 1/250 second
5 drug [不可数名词] informal an illegal drug that makes you very active 同义词 amphetamine
6 five-speed/ten-speed etc having five, ten etc gear s :
a ten-speed bike
7 up to speed having the latest information or knowledge about something :
Some school officials are only now getting up to speed regarding computers.
John will bring you up to speed (= tell you the latest information ) .
→ full speed/steam ahead at full 1 ( 18 )
COLLOCATIONS
动词
increase your speed He increased his speed until he was running flat out.
gain/gather/pick up speed (= go faster ) The Mercedes was gradually picking up speed.
reach a speed The trains will reach speeds of 140 mph.
maintain a speed (= keep the same speed ) The aircraft is designed to maintain a steady speed.
reduce speed (= slow down deliberately ) She reduced speed as she approached the village.
lose speed (= slow down without wanting to ) The engine made a strange sound and we lost speed.
ADJECTIVES/NOUN + speed
an average speed Our average speed was 88 mph.
a constant/steady speed The disc revolves at a constant speed.
a top/maximum speed (= the highest possible ) The car has a top speed of 132 mph.
wind speed (= the speed of the wind ) The average wind speed will be about 14 knots.
air speed (= the speed of a plane in relation to the air around it )
短语
at high/great speed The train was travelling at high speed.
at low/slow speed Even at low speed, an accident could mean serious injury for a child.
at full speed (= running, driving etc as fast as possible ) He ran past us at full speed.
at/with lightning speed (= very quickly ) He moved with his usual lightning speed.
at breakneck speed (= very quickly ) He drove away at breakneck speed.
speed + NOUN
a speed limit The speed limit is 40 mph here.
a speed restriction New speed restrictions have been introduced.
a speed camera (= designed to photograph vehicles going too fast ) Most GPS systems will warn you when there are speed cameras.