1、speed up

a、加快(…的)速度

You notice that your breathing has speeded up a bit...

你注意到自己的呼吸加快了一些。

He pushed a lever that speeded up the car.

他挂挡加快了速度。

b、(使)(某一过程或活动)加快

Job losses are speeding up.

失业趋势正在不断加快。

I had already taken steps to speed up a solution to the problem...

我已经采取措施加快解决该问题。

2、below

a、介词（位置）在…下面，低于

He appeared from the apartment directly below Leonard's...他从伦纳德家正下方的公寓里走了出来。

b、在地下；在地表以下

They have designed a system which pumps up water from 70m below ground...

他们设计了一套从地下70米处抽水的系统。

c、以下；在下文中

Please write to me at the address below...

请按照下面的地址给我写信。

d、（数量、比率或水平）低于，小于，少于

Night temperatures can drop below 15 degrees Celsius.

夜间气温会降到15摄氏度以下。