reduce的用法

　　例句：

　　The number of employees was reduced from 40 to 25.

　　雇员人数从40人减少到了25人。

　　Costs have been reduced by 20% over the past year.

　　过去一年，各项费用已经减少了20%。

　　We can reduce the problem to two main issues.

　　我们可以将这个问题概括成两个要点。

　　There is some noise in the data which needs to be reduced.

　　资料里有一些需要删除的不适用信息。

　　We'll need to reduce the weight by half.

　　我们得把重量减轻一半。