常用动词、名词及短语有：

accelerate (使)增加速度，加速，加快

decelerate (使)降低速度， (使)减速，减慢

retard (使)放慢， (使)减速

slow down (使)慢下来， (使)减速

speedup (使)加速， (使)加快

rate 速率；速度；快慢；变化率

speed 快；迅速；速率；速度

velocity 速度，速率

at a/the rate of ... 以…的速度(速率)

at/with a/the speed of ... 以…的速度(速率)

at/with a/the velocity of ... 以…的速度

The speed/velocity of the aircraft increases/rises．

飞机的速度加快／上升。

The speed/velocity of the fluid decreases/falls．

流体的速度减慢／下降。

The rate of descent of an aeroplane is measured in metres of height per second．

飞机下降的速率是以每秒高度米数来测量的。

The aircraft increases speed/speeds up/accelerates．

飞机加快速度。

The aircraft decreases speed/reduces speed/slows down/decelerates．

飞机减慢速度。

There is an increase in speed .

速度有所增加。

There is a decrease/reduction in speed．

速度有所减小。

Opening the throttle of a car accelerates it/makes it go faster．

打开汽车的风门能使汽车加速。

Applying the brake of a car retards it/makes it go slower．

使用汽车的刹车可使汽车减慢速度。

Light travels at a speed of 299,728 kilometres per second．

光以 299 728 公里每秒的速度传播。

If only one pair of field poles is used in a generator , the armature must turn at a rate of 60 revolutions per second a to produce 60-cycle current．

如果发动机里只使用一对磁场极，电极必须以 60 转每秒的速度旋转才能产生 60 周的电流。

The magnet turns at the rate of 50 revolutions per second．

磁铁以 50 转每秒的速度旋转。

The population of the world is growing at a dangerous rate．

世界人口正以危险的速度在增长。

In fact , there is a maximum velocity at which any object may fall freely through air, regardless of the duration of its fall．

事实上， 任何物体不论其下落的时间有多长，都有一个可通过空气自由下落的最大速度。