n (1)钱数，金额(amount or quantity of money)[C][N (of)]：huge～s 巨额款项;be fined the～of $2000 被罚2000美元;cost an enormous～to repair the swimming pool 花一大笔钱去修理游泳池;

(2)算术(运算)(arithmetical calculation)[C，常pl]：do～s/a～in one's head 做算术/心算;be good at～s 擅长算术;

(3)和，总计(数)(total obtained as a result of addition)[C，通常sing][N (of)]：The～of 6 and 3 is 9. 6加3的和是9。What is the～of 10，9 and 8? 10加9加8的和是多少?

(4)全部，总共(the whole;all of sth)[C，the～][N (of)](=sum total)：the～(total) of our knowledge/his experience我们全部的知识/他全部的经验;The～total of expenses for the trip was $450. 旅行的花销总共是450美元。

in sum 简言之(旧用法)：In～，Mr. Morgan's report wasn't perceptive at all. 总之，摩根先生的报告讲得一点也不透彻。

v

sum up (v adv) 1)总结，概括(give the main or important points of sth)(vt & vi)：～up all sb has said/the main points of the lesson 概括某人所说的一切/本课的重点;Now～up in your own words. 现在用你自己的话概括一下。2)估量，判断(consider and form a(n) judgement or opinion of sb or sth)(vt)：～up the situation at a glance 一眼就认清了形势;～sb up as a fool 看出某人是个傻瓜;

→summing-′up n 法官对讼案中证据和辩论的总结;概述;′summary n 摘(概)要;adj 概括的，扼要的;′summarily adv 概括地，扼要地;′summarize，-ise v 概括(述)，总结;sum′mation n 求和;总数;

【辨异】sum与number的区别见NUMBER。