因为我已经告诉你了，你应该知道。

As I have told you, you should know.

youdao

这个学生现在已经是博士了。 他说：老实告诉你，过去三年我没有跟任何朋友见过面，因为我在写博士论文。

To tell you the truth, I haven't seen any of my friends for the past three years because I was working on my PH.D. dissertation.

youdao

这个学生现在已经是博士了。他说：老实告诉你，过去三年我没有跟任何朋友见过面，因为我在写博士论文。

To tell you the truth, I haven't seen any of my friends for the past three years because I was working on my PH.D. dissertation.

youdao

I don't need to tell you the volume here, because you've got enough information to calculate the volume.

这里我不需要告诉你体积，因为你已经获得了足够多的信息,来计算体积。

麻省理工公开课 - 热力学与动力学课程节选