Scorpions glow under ultraviolet light, but scientists do not know why.
蝎子在紫外线的照射下能发光，但是至今科学家还没解开这个谜。
After all, how can you know that the project is blowing up but not know why?
毕竟，你怎么会知道项目搞砸了但是不知道为什么呢？
A Cole Porter song, In the Still of the Night, goes through my head. I do not know why.
不知何故，我的脑海中浮想起了科尔·波特的歌《静夜》。
He said he did not know why major life events appeared to have different effects on men than women.
他声称，他仍无法弄清人生重大事件变化为什么对男人与对女人影响有所不同。
I admit I do not know why average degree of happiness has not risen in recent decades in the US as incomes rose.
我承认我的确讲不清为什么美国的平均幸福度在最近几十年没有随着收入的增加而提高。
Scientists do not know why dinosaurs became extinct.
科学家不知道恐龙为何绝种了。
Her friends started falling away and she did not know why.
她的朋友开始疏离她，她又不明就里。
We find our dating relationships crumbling to pieces and we do not know why.
我们发现我们的约会关系瓦解成碎片，我们不知道为什么。
Do not know why I still wanted to write, I would like to leave something here.
可不知道为什么我却还是想写，想在这里留下些什么。
I do not know why tell these things with you, but I can see her shadow from you!
我不知道为什么要告诉你这些事情，但是我能从你身上看到她的影子。
I do not know why, as long as you are in me, my heart is no longer on tenterhooks.
不知为什么，只要有你在我身边，我的心便不再惶惶不安。
He did not even take part in last year's national championships. I do not know why.
他甚至没有参加去年的国家锦标赛，我不知道什么原因。
Researchers do not know why people think some colors are warm and other colors are cool.
研究人员不了解为什么人们认为有些颜色暖而另一些颜色冷。
Police said one of those killed was in the car but said they did not know why the motorist had stopped.
警方说其中一位死者是小汽车的驾驶人，但是他们还不知道为什么这位司机要把车停在这里。
Powell did not know why it was he had resolved to keep his own counsel as to his colloquy with Mr Smith.
鲍威尔不知道为什么决定要把他跟史密斯先生的谈话保守秘密。
I was walking by the road, I do not know why, when the noonday was past and bamboo branches rustled in the wind.
我在路边行走，也不知道为什么，时已过午，竹枝在风中簌簌作响。
He was bigger than I expected: I do not know why I had imagined him slender and of insignificant appearance.
他比我预想的要魁梧：我不知道我为什么曾想象他是个细长个儿，仪表不足道。
Certainly I did not know why I had to come here, but I knew that I would at least not be starving to death if I stayed here.
当然，我也不知道我为什么要来到这里，但我知道我在这里还不至于饿死街头。
If you want to express a feeling of surprise, you might cry "holy mackerel!" although we do not know why a mackerel is holy.
如果你想表达一种惊奇的感觉，你会大叫“好家伙”，尽管我们不知道为什么鲭鱼是神圣的。
Anthropologists do not know why one culture develops one type of time-space perception and another culture develops another type.
人类学家不知道为什么一种文化会产生一种时空观，而另一种文化却会产生另一种时空观。
However, she added, "we do not know why smoking did not affect men's weight, as we do not know why smoking affected women's weight."
她还说：“我们不知道为什么吸烟不会影响男性的体重，同样也不知道为什么对女性体重的影响那么大。”
When we set out on an extended travel by ourselves, we may not know why we are going when we begin, and it may only be clear when we come back.
当我们动身做长期旅行时，开始我们也许不并知道为什么这样做，但我们回来时答案变得透彻明了。
Scientists do not know why dinosaurs became extinct, but some theories postulate that changes in geography, climate and sea levels were responsible.
科学家们不知道恐龙为何灭绝，但一些理论假定这与地理气候条件和海平面的某些变化有关。
Scientists do not know why dinosaurs became extinct, but some theories postulate that changes in geography, climate, and sea levels were responsible.
科学家不知道恐龙为什么会消失，但是，有些理论提出，地理、气候和海面的变化可能是原因。
Actually children have quarrels all the time but they reconcile again very fast, just I do not know why we never spoke to each other ever again after that!
其实小孩子通常都会有争执，可是过后又会和好，只是不知何故我们那一次过后就没有再讲过一句话！
Actually children have quarrels all the time but they reconcile again very fast, just I do not know why we never spoke to each other ever again after that!
其实小孩子通常都会有争执，可是过后又会和好，只是不知何故我们那一次过后就没有再讲过一句话！
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