加速

The speed limit on this road is 70 mph. 這條路的車速限制是每小時70英里。

He was fined for speeding to the tune of 200. 他因超速行車被罰款達 200 英鎊。

The acceleration is positive if the speed is increased, negative if speed is decreased. 速度增加的加速度為正加速度，速度減少的加速度為負加速度。

The speed limit is 40 miles per hour. 規(guī)定的最高時速為40英里。

The cruiser's speed is 50 miles per hour. 巡洋艦的速度每小時有50海里。

They've speeded up production of the new car. 他們加快了新汽車的生產。

The train soon speeded up. 火車不久就加快了速度。