在日常用语中，这两个词没有区别，可以通用。而在物理学里，velocity 是一个矢量(vector quantity)表示起点与终点间直线距离的长度除以所用时间所得的量，并注明方向：而 speed 是一个数量(scalar quantity)，是指起点到终点所走过的所有路程除以所用时间所得的量，且不标明方向。拓展资料velocitynoun[U, C]【不规则形式】 pl. -ies1(technical 术语) （沿某一方向的）速度 the speed of sth in a particular directionthe velocity of light光速to gain/lose velocity 加 / 减速a high-velocity rifle高速步枪2(formal) 高速；快速 high speedJaguars can move with an astonishing velocity.美洲豹跑起来速度惊人。speednoun运动 / 行动速率 rate of movement/action1[C, U] （运动的）速度，速率 the rate at which sb/sth moves or travelsHe reduced speed and turned sharp left.他减慢速度，向左急转。The train began to pick up speed (= go faster) .火车开始加速。The car was gathering speed .汽车逐渐加速。a speed of 50 mph/80 kph每小时50英里 / 80公里的速度at high/low/full/top speed 以高 / 低 / 全 / 最高速at breakneck speed (= fast in a way that is dangerous) 以不要命的速度travelling at the speed of light/sound 以光速 / 音速行进see also airspeed, ground speed2[C, U] （发生或进行的）速度；进度 the rate at which sth happens or is donethe processing speed of the computer计算机的处理速度This course is designed so that students can progress at their own speed.这门课的设计思路是让学生自己掌握进度。We aim to increase the speed of delivery (= how quickly goods are sent) .我们力争提高送货速度。3[U] 快；迅速 the quality of being quick or rapidThe accident was due to excessive speed.事故的原因在于速度过快。She was overtaken by the speed of events (= things happened more quickly than she expected) .事态发展迅速为她始料所不及。(formal) A car flashed past them at speed (= fast) .一辆汽车从他们身边疾驰而过。摄影 in photography4[C] 感光度 a measurement of how sensitive film for cameras, etc. is to light5[C] 快门速度 the time taken by a camera shutter to open and closeshutter speeds快门速度
秋水伊人ying
