This is why you can't procrastinate.

而这也是为什么你不能再拖延了。

youdao

This is why you can sit all day and still feel tired.

这就是为什么你坐了一整天，还会感觉累。

youdao

This is why you have to take care of what your are doing.

这就是为何你必须关心你手头在做的事情的原因。

youdao

"Why aren't more science talks in a bar,right? Like this is the place where you learn and you ask and you understand things most quickly, instead of a lecture where it's really just a one-way thing."

VOA: special.2010.05.14

So this is why you sometimes had Jews getting in trouble with local groups and had violence with Jews in different places.

所以犹太人常常与当地人发生冲突,在各地都发生涉及犹太人的暴力事件。

耶鲁公开课 - 新约课程节选

And this is line 679: Why should you be so cruel to yourself, And to those dainty limbs which nature lent For gentle usage and soft delicacy?

在第679行：，你为什么要对自己那么残忍，对于大自然赋予我们的四肢,只文雅的使用和温和的对待佳肴？

耶鲁公开课 - 弥尔顿课程节选

This is why you offer insurance, so they do have access to these treatments.

FORBES: How A $440,000 Drug Is Turning Alexion Into Biotech's New Innovation Powerhouse

So this is why you're here. (Applause.) It was an excellent idea -- excellent idea.

WHITEHOUSE: The First Lady Celebrates Women in the Military

This is why you can exchange files with people through email without having to include entire applications.

CNN: How do I retrieve a lost file?