没有人真正了解原因。
"Nobody really knows why dolphins have the impact that they do," she says.
“没有人真正知道为什么海豚会有那样的影响力，”她说。
A birdwatcher kept an eye on his activities with his large binoculars. Nobody really knows why.
一个鸟类观察者用他的大望远镜观察他的一举一动，没人知道为什么。
People with diabetes are at a higher risk of developing Alzheimer's but nobody really knows why.
糖尿病患者比一般人患阿尔茨海默氏症的几率更高，但是没有人知道这是为什么。
The Big Ben is very famous throughout the world, but nobody really knows why it is called Big Ben.
大本钟在世界上家喻户晓，但实际上没有多少人知道为何它叫大本钟。
As for the larger question of why yawns are catching, nobody really knows.
至于那个更深的问题，为什么打哈欠是传染的，还没有答案呢。
And nobody really knows what it is or why it's there.
没有人真正知道它是什么，或是它为什么存在？
Nobody really knows how or why. We are like that.
没有人真的明白这是什么道理，但我们却也都像这样长大的。
Nobody really knows how or why. We are like that.
没有人真的明白这是什么道理，但我们却也都像这样长大的。
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