学习资料

[意       思]n. 总数，总和，总计
[例]  She paid the sum of $200 for dresses. 她买衣服总共花了二百元钱。
n. 金额，一大笔
[例]  He earned a large sum of money. 他赚了一大笔钱。
n. 算术题，心算
[例]  The boy is good at doing a sum in his head. 这男孩善于心算。
vt. 总结，概括，概述
[例]  The story may be summed up in one sentence. 该故事可以用一句话来概括。

更多意思

n.1.  总和,总数
2.  金额
3.  (简单的）计算，算术
4.  全部，所有

vi.合计

vt.总计, 概括

参考例句

1.	Let x be the sum of a and b.
	设x为a与b之和。
2.	What is the sum assured?
	人寿保险额是多少？
3.	We still need 100 to make up the sum required.
	我们还需要100英镑才能达到所需的数目。
4.	He got paid a piffling sum after weeks of work.
	他工作数周所得甚微。
5.	They presented a sum of money to the college in memory of their son.
	他们向学院赠送了一笔款项以纪念他们的儿子。
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常用词组

 

in sum   总而言之
sum up   总结, 概括