n. 速度( speed的名词复数 ); 快速; 快门速度; 感光度

v. 急行, 加速( speed的第三人称单数 ); 超速行驶; 快速运送; 加速, 促进

n distance travelled per unit time

n a rate (usually rapid) at which something happens

n changing location rapidly

n the ratio of the focal length to the diameter of a (camera) lens system

n a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression

v move fast

v move faster

v move very fast

v travel at an excessive or illegal velocity

v cause to move faster