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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。

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