速度
?speed;rate;pace;tempo
?velocity（物理）
?tempo（音樂）
事故的原因在于～過快。The accident was due to excessive speed./加快～ pick up (or gather) speed;speed up; accelerate; gain velocity/減緩～reduce speed; slow down;lose velocity/每小時100千米的～a speed of 100kph/以不要命的～ at a breakneck speed /以跨越式的～發(fā)展develop by leaps and bounds;leapfrog development/國民經(jīng)濟(jì)增長～growth rate of the national economy/光的～velocity of light/～滑冰speed skating/～計(jì)velocimeter;speed indicator;speedometer