| 单词 | speed |
| 释义 | Word Frequency speed(spiːd) noun 1. the act or quality of acting or moving fast; rapidity 2. the rate at which something moves, is done, or acts 3. physics a scalar measure of the rate of movement of a body expressed either as the distance travelled divided by the time taken (average speed) or the rate of change of position with respect to time at a particular point (instantaneous speed). It is measured in metres per second, miles per hour, etc 4. a rate of rotation, usually expressed in revolutions per unit time 5. a. a gear ratio in a motor vehicle, bicycle, etc b. (in combination) a three-speed gear 6. photography a numerical expression of the sensitivity to light of a particular type of film, paper, or plate See also ISO rating 7. photography a measure of the ability of a lens to pass light from an object to the image position, determined by the aperture and also the transmitting power of the lens. It increases as the f-number is decreased and vice versa 8. a slang word for amphetamine 9. archaic prosperity or success 10. at speed 11. up to speed verbWord forms: speeds, speeding, sped or speeded 12. to move or go or cause to move or go quickly 13. (intransitive) to drive (a motor vehicle) at a high speed, esp above legal limits 14. (transitive) to help further the success or completion of 15. (intransitive) slang to take or be under the influence of amphetamines 16. (intransitive) to operate or run at a high speed 17. archaic a. (intransitive) to prosper or succeed b. (transitive) to wish success to Derived forms speeder (ˈspeeder) noun Word origin Old English spēd (originally in the sense: success); related to spōwan to succeed, Latin spēs hope, Old Slavonic spěti to be lucky |
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