新闻来源；消息灵通人士用英语怎么说

新闻来源；消息灵通人士的英文：
source

They are trying to trace the source of the trouble.
他们正设法找出这件麻烦事的起因。

Where is the source of the Nile?
尼罗河发源于何处？

Is the water polluted at source?
河水是在源头受到污染的吗？

We understand that sourcing is not static.
我们明白采购不是一成不变的。

Religion is not the only source of division.
宗教问题并不是分裂的唯一来源。