The computer system will be shut down over the weekend.

计算机系统周末关闭。

2. on behalf of 代表
 

On behalf of the department I would like to thank you all.

我谨代表本部门感谢大家。

3. be short of 缺乏
 

The country is running short of hard currency to pay for imports.

该国目前缺乏硬通货来支付进口货物。

4. a number of 一些；许多
 

I have a number of things to do today.

我今天有许多事情要做。