Why this pigment is there and what it might do was unknown.
这种色素为什么会存在和它可能有什么作用是未知的。
This is why this is so exciting.
这正是我们如此兴奋的原因。
It is not clear why this should be.
我们不清楚为什么会这样。
Why this happens is still a mystery.
产生这种效果的原因还是个谜。
找出故障发生的原因。
I don't wonder why this is happening.
我并不奇怪为什么会爆发这场运动。
That is why this time may be different.
这就是为什么这一次可能会有所不同。
Why this sudden need for citizens’ cash?
为什么这么突然要民众掏腰包？
为什么会有如此信心？
You may wonder why this is a problem now.
您可能会疑惑为何这现在才成为了问题。
That's why this report matters today.
这也是这份报告在今天依然重要的原因。
Can you guess why this man is smiling?
你能猜出这个人为什么笑吗？
Figure 2 illustrates why this is important.
图2展示了为什么这很重要。
Now we are, and that's why this is different.
现在我们这样做了，所以有些不同了。
为什么是这个工具？
But exactly why this should happen is unclear.
但到底为什么会发生这种事情，人们还不清楚。
He admits they don't yet know why this is true.
他承认现在还无法解释为什么会这样。
Now let's discuss why this session is necessary.
现在，让我们讨论一下这一会议为什么重要。
One day he asked his father why this was so.
一天，他就问她父亲其中的道理。
There are many reasons why this would be good.
之所以这样说的原因有很多。
I'm still investigating why this might be the case.
我还在调查这个情况为什么会出现。
You'll see later why this distinction is important.
我们稍后将来看一下为什么这种区别非常重要。
Which is why this research on smiling is so unusual.
这也是为什么这项对微笑的研究如此不同寻常。
Okay does everyone see why this is a valid argument?
大家都明白为什么这是有效论点了吧？
Okay does everyone see why this is a valid argument?
大家都明白为什么这是有效论点了吧？
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