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TOEFL BNC: 1671 COCA: 3843
*sum¹
/sʌm ||; sʌm/noun[C]
1 an amount of money 一笔（钱）: The industry has spent huge sums of money modernizing its equipment. 业界已耗费巨额资金使设备现代化。
2 [usu.sing] the sum (of sth) the amount that you get when you add two or more numbers together 和；总数: The sum of two and five is seven. 二加五等于七。
3 a simple problem that involves calculating numbers 算术题: to do sums in your head 心算
sum²
/sʌm ||; sʌm/verb (summing;summed) sum (sth) up to describe in a few words the main ideas of what sb has said or written 总括: To sum up, there are three options here... 概括地说，有三种选择… sum sb/sth up to form an opinion about sb/sth 形成看法: He summed the situation up immediately. 他立即认清了当时的情况。
TOEFL BNC: 1671 COCA: 3843
sum1/sʌm; sʌm/ n [C] 1 an amount of money 金额: The city has spent a large sum of money on parks. 这座城市花了一大笔钱在公园上。 2 the sum of sth the total when you add two or more numbers together 某事物的和[总和﹐总数]: The sum of 4 and 5 is 9. 4 和 5 的和是 9。 3 BrE a simple calculation such as adding or dividing numbers【英】算术
sum2 v summed , summing sum up phr v 1 to end a discussion or speech by giving the main information about it in a short statement 总结﹐概括: So, to sum up, we need to organize our time better. 因此﹐总而言之﹐我们需要更好地安排时间。sum sth up You should sum up your argument in the final paragraph. 你应该在最后一段总结论点。 2 sum sth up to form an opinion about someone or something 对…形成意见: Pat summed up the situation at a glance. 帕特一眼就判断了当时的形势。 —summing-up n [C]
TOEFL BNC: 1671 COCA: 3843
sum sumsumssummedsumming nounpronunciationThe word sum sounds just like some.1an amount of money: £200 000 is a large sum of money.2the answer that you have when you add numbers together: The sum of two and five is seven.3a simple piece of work with numbers, for example adding or dividing: Children have to learn how to do sums.

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