/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