sum

"Sum"源自拉丁语"Summa"，意为“总数”或“全部”，这几乎与现在在英语中的含义相符。

["n. 金额；总数\n vi. 概括\n vt. 总结；合计\n n. (Sum)人名；(英)萨姆；(柬)孙；(俄、德、捷)苏姆；(越)森\n \n [\n 复数\n sums或sumy\n 第三人称单数\n sums\n 现在分词\n summing\n 过去式\n summed\n 过去分词\n summed\n ]"]

It must have cost a tidy sum.

这准花了相当大的一笔钱。

Let x be the sum of a and b.

设x为a加b之和。

The sum was paid ex gratia.

这是所付的一笔特惠款。

将"Sum"与数学中的概念联系起来。记住它是所有数字或项目的"总数"，这样一来，当你要想出这个词时，就可以快速记住它。

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And so the mentality has to shift fromzero-sum to positive-sumbefore you can get a productive politics.

Will there even be mammals?In sum,we have learned a lot about dinosaurs.

30 seconds eachto sum up.Your final pitch, Stewart.

This won't hurt. Okay.It's about zero-sum and non-zero-sum games.If you ask what kind of a situation

You know, it costs us so much to remain divided.This zero-sum thinking,that's what's good for one group has to come at the expense of another,

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