n.[C]

1. 总数，总和，总计[the S][（+of）]
   She paid the sum of $200 for dresses.

   她买衣服总共花了二百元钱。

2. 【数】和[the S][（+of）]
3. 金额；一笔[（+of）]
   He earned a large sum of money.

   他赚了一大笔钱。

4. 概要；要点[the S][（+of）]
5. 算术题；运算
   The boy is good at doing a sum in his head.

   这男孩擅长心算。

6. 顶点，极度[the S][（+of）]

vt.

1. 计算……的总和[（+up）]
2. 总结；概括；概述[（+up）]
   The story may be summed up in one sentence.

   该故事可以用一句话来概括。

vi.

1. 共计[（+to/into）]

n.

1. a particular amount of money.
2. (the sum of) the total amount resulting from the addition of two or more numbers or amounts.
   ▸the total amount of something that exists.
3. an arithmetical problem, especially at an elementary level.

v.

1. (sum someone/thing up) concisely describe the nature or character of someone or something.
   ▸ (sum up) summarize briefly.
2. (sum up) Law  (of a judge) review the evidence at the end of a case, and direct the jury regarding points of law.
3. technical find the sum of (two or more amounts).