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。
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。
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。
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。
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。
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。
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。
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？
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？
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。
Lack of space in Athens is the main reason why the dead are dug up after three years.
在雅典，尸体埋葬三年后就要被挖出的主要原因是用地不足。
The main reason was that steel cables degrade very, very quickly in contact with saltwater.
主要原因是钢索与盐水接触后降解非常快。
Finally, Krugman conveniently forgets that concerns about global warming are the main reason that corn prices have skyrocketed since 2005.
最后，2005年以来玉米价格暴涨的主要原因是对全球变暖的担忧，这一点被克鲁格曼轻易地漏掉了。
"You have to grumble in life, otherwise you get trampled on," was the main reason given by almost one in six people in the land of liberty and equality.
在这个自由平等的国度里，近六分之一的人给出的主要理由是：“在生活中你必须抱怨，否则你会被踩在脚下。”
She says the main reason the U.N. cultural organization didn't vote to declare Venice a World Heritage Site In Danger is because UNESCO has become "intensely politicized".
她说，联合国文化组织没有投票宣布威尼斯成为世界濒危遗产地的主要原因是联合国教科文组织已经变得“极度政治化”。
Until recently, the main reason for removing dams was to restore salmon runs, but it is now recognized that a more important reason to remove dams is that they are no longer safe.
直到近期，拆除大坝主要还是为了恢复鲑鱼的数量，但现在人们认识到，拆除大坝的一个更重要的原因是这些大坝已不再安全了。
The main reason people pay extra for a Dyson is because it is a vacuum cleaner with a trendy brand.
人们愿意花更多的钱买戴森是因为它是一个时尚品牌的真空吸尘器。
This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.
正是由于这种集声，即使是海洋中相对微弱的声音，尤其是低频声音，也能传播数千英里。
最主要的原因：天然气。
钱不是主因。
The main reason: problems with yields.
其主要原因是：产量的问题。
I'd say the main reason is poverty.
我得说主要是贫穷。
The main reason for growth is demographic.
人口是促进市场增长的主要原因。
The main reason to adopt SAX is efficiency.
采用SAX的主要原因是效率。
The main reason... is simply psychological.
这其中主要的原因……仅仅是心理上的。
It's the main reason people leave their jobs.
这是辞职的主要原因。
The main reason is the fall in mortgage rates.
主要原因是抵押贷款利率的下降。
The main reason, he thinks, is ethnic identity.
他认为，这种转变主要的原因是种族的同一性。
What is the main reason behind this success?
这种成功最主要的原因是什么呢？
What is the main reason behind this success?
这种成功最主要的原因是什么呢？
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