1. 款项;金额
    A sum of money is an amount of money.

    e.g. Large sums of money were lost...
           损失了大笔钱财。
    e.g. Even the relatively modest sum of £50,000 now seems beyond his reach.
           现在即使是相对来说并不算多的 5 万英镑对他来说也是遥不可及的。

2. 算术;简单计算
    A sum is a simple calculation in arithmetic.

    e.g. I can't do my sums.
           我算不出来。

3. 和;总和;总数
    In mathematics, the sum of two numbers is the number that is obtained when they are added together.

    e.g. The sum of all the angles of a triangle is 180 degrees.
           三角形内角总和为 180 度。

4. 全部;所有
    The sum of something is all of it.

    e.g. 'Public opinion' is only the sum of the views of thousands of people like yourself...
           “舆论”只是所有像你一样的成千上万人的意见的总和。
    e.g. The sum of evidence points to the crime resting on them...
           所有证据都表明该犯罪乃他们所为。

5. see also: lump sum

6. 总之;总而言之
    You use in sum to introduce a statement that briefly describes a situation.

    e.g. In sum, the two countries are now true economic partners...
           总而言之，两国目前是真正的经济合作伙伴。
    e.g. It is a situation, in sum, devoid of logic.
           总之，该情况毫无逻辑。

7. 个体相加不如集体的力量大;总体大于个体之和
    If you say that something is more than the sum of its parts or greater than the sum of its parts, you mean that it is better than you would expect from the individual parts, because the way they combine adds a different quality.

    e.g. As individual members' solo careers have proved, each band was greater than the sum of its parts.
           成员单飞后的发展证明，每个乐队的成员只有组合在一起才能创造出更大的成功。

相关词组：sum up