You owe a certain person a sum of money.

你欠着某人一笔钱。

《柯林斯英汉双解大词典》

He did her out of a sum of money.

他骗了她一笔钱。

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It is important to remember that success is a sum of small efforts made each day and often takes years of achieve.

重要的是要记住，成功是每天所做出的努力的总和，往往需要多年才能实现。

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Many outsiders sum up "Frenchness" through a series of cliches berets, baguettes, good cheese and wine.

VOA: standard.2009.12.30

If the product is just the sum or multiple of a sum of the inputs, there wouldn't be much of a point working in a team at all.

如果总收益只是投入的和或者倍数,那这样合作也没什么意思了

耶鲁公开课 - 博弈论课程节选

A mobile army of metaphors, metonymies, anthropomorphisms in short, a sum of human relations which became poetically and rhetorically intensified," "and are now no longer of account as coins but are debased."

一支由暗喻，转喻，拟人组成的机动部队,简单来说，人们之间的关系,诗意般地在修辞上加强了“,人们之间的关系不再值钱，而被贬低了“

耶鲁公开课 - 文学理论导论课程节选

Close and productive partnerships have made the mobile industry more than a sum of its parts.

FORBES: Mobile Phone Gaming Gets A Boost From Better Graphics Chips

He is also alleged to have stolen a sum of money from her home.

BBC: Mum says Garry Kane 'would not kill' Kathleen Milward

"At this stage it is not a sum of individual problems, it is a systemic problem, " he said.

BBC: Austerity: Views across Europe