| 单词 | speed |
| 释义 | speed (once / 62 pages) 1nv 2n 3n Speed most often describes acceleration or a high rate of motion. When something picks up too much speed, it can run off course, like a kid on a bike zooming uncontrollably down a steep hill. Speed can be a noun or verb. As a noun, it's an indicator of pace, as in the speed of a car. As a noun, it's also a drug that keeps you awake, very awake. As a verb, it means to “move along quickly,” like how you speed around on your bike. A fun fact: while speed refers to the distance traveled by an object during a specific amount of time, velocity describes that distance, but in a specified direction. WORD FAMILYspeed: sped, speeded, speeder, speeding, speeds, speedy+/speeder: speeders/speeding: speedings/speedy: speedier, speediest, speedily, speediness USAGE EXAMPLESThe speed limit on the turn was 30 mph. Seattle Times(Dec 01, 2016) It is not just in ports where machine learning could speed up scanning. Economist(Dec 01, 2016) The group have subsequently upped the speed at which they can propel water droplets to a heady ten millimetres a second. Economist(Dec 01, 2016) 1 1n a rate (usually rapid) at which something happens the project advanced with gratifying speed Syn|Hypo|Hyper fastness, swiftness haste, hastiness, hurriedness, hurry, precipitation overly eager speed (and possible carelessness) execution speed(computer science) the speed with which a computational device can execute instructions; measured in MIPS graduality, gradualnessthe quality of being gradual or of coming about by gradual stages abruptness, precipitance, precipitancy, precipitateness, precipitousness, suddennessthe quality of happening with headlong haste or without warning pace, rate the relative speed of progress or change 2n distance travelled per unit time Syn|Hypo|Hyper velocity angular velocity (physics) the rate of change of the angular position of a rotating body; usually expressed in radians per second or radians per minute airspeedthe speed of an aircraft relative to the air in which it is flying escape velocitythe minimum velocity needed to escape a gravitational field groundspeedthe speed of an aircraft relative to the ground hypervelocityexcessive velocity muzzle velocitythe velocity of a projectile as it leaves the muzzle of a gun peculiar velocityvelocity with respect to the local standard of rest radial velocityvelocity along the line of sight toward or away from the observer c, light speed, speed of lightthe speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second steerageway(nautical) the minimum rate of motion needed for a vessel to be maneuvered terminal velocitythe constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity rate a magnitude or frequency relative to a time unit 3n changing location rapidly Syn|Hypo|Hyper hurrying, speeding acceleration, quickening, speedup the act of accelerating; increasing the speed decelerationthe act of decelerating; decreasing the speed scud, scuddingthe act of moving along swiftly (as before a gale) motion, move, movement the act of changing location from one place to another 4v move fast Syn|Ant|Hypo|Hyper belt along, bucket along, cannonball along, hasten, hie, hotfoot, pelt along, race, rush, rush along, step on it dawdle, linger take one's time; proceed slowly barge, push forward, thrust ahead push one's way buck, charge, shoot, shoot down, tearmove quickly and violently dart, dash, flash, scoot, scud, shootrun or move very quickly or hastily plungedash violently or with great speed or impetuosity ripmove precipitously or violently go, locomote, move, travel change location; move, travel, or proceed, also metaphorically 5v move faster Syn|Ant|Hypo|Hyper accelerate, quicken, speed up decelerate, retard, slow, slow down, slow up lose velocity; move more slowly brisk, brisk up, brisken become brisk deepen, intensify become more intense 6v move very fast The runner zipped past us at breakneck speed Syn|Hypo|Hyper hurry, travel rapidly, zip dart, fleet, flit, flutter move along rapidly and lightly; skim or dart runmove fast by using one's feet, with one foot off the ground at any given time whizz, whizz along, zoom, zoom alongmove along very quickly butterflyflutter like a butterfly clip, jog, trotrun at a moderately swift pace scamper, scurry, scuttle, skitterto move about or proceed hurriedly romprun easily and fairly fast run basesrun around the bases, in baseball streakrun naked in a public place runrun with the ball; in such sports as football outrunrun faster than jogrun for exercise sprintrun very fast, usually for a short distance loperun easily rushrun with the ball, in football harerun quickly, like a hare go, locomote, move, travel change location; move, travel, or proceed, also metaphorically 7v travel at an excessive or illegal velocity I got a ticket for speeding Hyper go, locomote, move, travel change location; move, travel, or proceed, also metaphorically 8v cause to move faster 2Syn|Ant|Hyper accelerate, speed up decelerate, slow down reduce the speed of alter, change, modify cause to change; make different; cause a transformation n the ratio of the focal length to the diameter of a (camera) lens system 3Syn|Hyper f number, focal ratio, stop number ratio the relative magnitudes of two quantities (usually expressed as a quotient) n a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression Hypo|Hyper amphetamine sulfate, amphetamine sulphate a sulfate derivative of amphetamine that is used as a stimulant for the central nervous system Benzedrine, benniea form of amphetamine Dexedrine, dextroamphetamine sulphatean isomer of amphetamine (trade name Dexedrine) used as a central nervous system stimulant drug of abuse, street drug a drug that is taken for nonmedicinal reasons (usually for mind-altering effects); drug abuse can lead to physical and mental damage and (with some substances) dependence and addiction excitant, stimulant, stimulant druga drug that temporarily quickens some vital process |
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