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n (1)錢數(shù)，金額(amount or quantity of money)[C][N (of)]：huge～s 巨額款項;be fined the～of $2000 被罰2000美元;cost an enormous～to repair the swimming pool 花一大筆錢去修理游泳池;

(2)算術(shù)(運算)(arithmetical calculation)[C，常pl]：do～s/a～in one's head 做算術(shù)/心算;be good at～s 擅長算術(shù);

(3)和，總計(數(shù))(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，總共(the whole;all of sth)[C，the～][N (of)](=sum total)：the～(total) of our knowledge/his experience我們?nèi)康闹R/他全部的經(jīng)驗;The～total of expenses for the trip was $450. 旅行的花銷總共是450美元。

in sum 簡言之(舊用法)：In～，Mr. Morgan's report wasn't perceptive at all. 總之，摩根先生的報告講得一點也不透徹。

v

sum up (v adv) 1)總結(jié)，概括(give the main or important points of sth)(vt & vi)：～up all sb has said/the main points of the lesson 概括某人所說的一切/本課的重點;Now～up in your own words. 現(xiàn)在用你自己的話概括一下。2)估量，判斷(consider and form a(n) judgement or opinion of sb or sth)(vt)：～up the situation at a glance 一眼就認(rèn)清了形勢;～sb up as a fool 看出某人是個傻瓜;

→summing-′up n 法官對訟案中證據(jù)和辯論的總結(jié);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)，總結(jié);sum′mation n 求和;總數(shù);

【辨異】sum與number的區(qū)別見NUMBER。