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1·Human activity is the main reason for this, the United Nations (UN) said.

联合国表示，人类活动是造成这一现象的主要原因。

2·The main reason why this place is so important to me is my grandmother.

这个地方对我如此重要的主要原因是我的祖母。

3·The main reason for using 11 digits is that we have the largest population in the world.

使用11位数字的主要原因是我们拥有世界上最多的人口。

4·I think the main reason is that parents and children seldom have a talk with each other.

我认为主要原因是父母和孩子交谈太少。

5·Haters say the noise caused by square dancing is the main reason why they are against it.

反对者称广场舞带来的噪音是他们反对广场舞的主要原因。

6·Killing time is the main reason for me to watch the short videos, but many are almost the same, so I think it is a waste of time.

对我来说，看短视频的主要原因是消磨时间，但它们大多数几乎都一样，所以我觉得这是浪费时间。

7·It could be the main reason for my improvement in French.

这可能是我法语进步的主要原因。

8·What could be the main reason for the writer's improvement in French?

作者法语水平提高的主要原因是什么？

9·What's the main reason for the father teaching his daughters to wrestle?

父亲教女儿们摔跤的主要原因是什么？

10·The Year of the Goat was the main reason for the low newborns in 2015, a report said.

一份报告称，羊年是2015年新生儿出生率低的主要原因。