重 点
In mathematics, the sum of two or more numbers is the number that is obtained when they are added together. (数字的) 和
noun [抽象名词] 金额，款项；算术，简单计算；总数，总和；全部，一切（尤指数量不大）；<英>计算失误；<英>计算费用
Large sums of money were lost. 大笔大笔的钱损失了。
verb [vi. 不及物动词] 概括，总结；求…的和，计算…的总数
It must have cost a tidy sum. 这准花了相当大的一笔钱。
- sum 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 21 Mad or not? sum 名词: 量
- Lesson 45 A clear conscience
总额
- 网友用 “Sum” 造句精选
- To date, the sum of my gardening experience had been futile efforts to rid the flower beds of grass. 迄今为止，我全部的园艺经验就是给花圃徒劳地除草。
- Let x be the sum of a and b. 设x为a加b之和。
- The sum of all the angles of a triangle is 180 degrees. 一个三角形的所有角度之和是180度。
- The sum was paid ex gratia. 这是所付的一笔特惠款。
量、和(加法)
a sum of + 不可数名词 一笔…
a large sum of 大笔的… (large 指数量的大)
- a large sum of money 一大笔钱