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1·To sum up, both the writer and professor made strong points to support their stance.

总之，作者和教授都提出了有力的观点来支持他们的立场。

2·Now, to sum up, in today's lecture, we have reviewed some of the reasons or factors that lie behind the popular use of English as the number one world language.

现在，总结一下，在今天的课上，我们回顾了英语作为世界第一语言的流行背后的一些原因或因素。

3·To sum up , there are three main ways of tackling the problem...

概括起来说，这一问题主要有三种解决办法…《牛津词典》

4·Ask yourself to sum up the text and try to work out a big idea.

让自己去总结文本，试着想出一个“大致的想法”。

5·Which Chinese character would you choose to sum up the past year?

你会选择哪个汉字来总结过去的一年？

6·To sum up, it is an amazing film which is suitable for both children and adults.

总而言之，这是一部既适合儿童又适合成人的精彩电影。

7·You need to avoid introducing new stuff here, it's got to sum up what you've said earlier.

你需要避免在这引入新的东西，它必须总结你之前说的东西。

8·To sum up, learning is affected by emotions of both the individual and significant others.

综上所述，学习受到个人和身边其他重要的人的情绪的影响。

9·To sum up: a system of conservation based solely on economic self-interest is hopelessly lopsided.

总而言之：一个完全基于经济利己主义的保护体系是不可救药的不平衡。

10·To sum up, we should try to bring the advantages of the Internet into full play, and reduce the disadvantages to the minimum at the same time.

综上所述，我们应该尽量发挥互联网的优势，同时把劣势降到最低。