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1、extent是个名词，可以翻译为程度。

2、例句：The Internet is just like a double-edged sword. Whether it does good or harm to us depends, to a great extent, on how we exploit and use it. 互联网就像一把双刃剑。

3、它对我们有益还是有害在很大程度上取决于我们如何开发利用它。

4、extend和expand都是动词，extend是指延伸，比如snooker杆的加长杆就是extention，例句：We have the desire to know more things about this world and is can extend our visual field. 我们想了解更多有关于这个世界的东西并拓宽自己的视野。

5、expand含有膨胀的意思，人口激增就用expansion 。

6、例句：The big western oil companies are trying to expand through acquisitions and investment, but the opportunities do so are becoming scarcer. 西方的石油大公司在尝试通过并购和投资来扩张,不过这样的机会已经越来越少。

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