不可数。意思是“一大笔”，大多数情况后接money。如：A large sum of money has been lost. 有一大笔钱丢失了。sum作可数名词意为“总述”、“算术”、“金额”、“要点”等意思。

a large sum of例句

He lost a large sum of money on the deal.

他在这笔交易上损失了一大笔钱。

She paid me a large sum of money for my services.

她为我的服务付给我一大笔钱。

I have been offered a large sum of money to go away.

他们曾向我提供一大笔钱让我搬走。

I have been offered a large sum of money to go a away.

他们曾向我提供一大笔钱让我搬走。

How do you account for losing such a large sum of money?

你怎样说明为什么损失了这么大一笔钱？