speeding up
n. 增速(加快)
例句与用法：
Installation of these machines will speed up production fifty per cent.
装备这些机器可以使生产速度加快百分之五十。
They've speeded up production of the new car.
他们加快了新汽车的生产。
The train soon speeded up.
火车不久就加快了速度。
We'd better speed up if we want to get there in time.
如果我们想准时到达那里，我们最好加快速度。
词形变化：
副词: speedily | 形容词比较级: speedier | 形容词最高级: speediest | 名词: speediness |