I said I dint know what that meens.

我回答说，我听不懂他们的话。

Theres more but I still dont know what it meens.

下面还有很多字，但我看不懂。

Do you understand what that meens.

你明白我的意思了吗？

And he said that meens Im doing somthing grate for sience and Ill be famus and my name will go down in the books.

这表示我对科学贡献很大，会出名，书本会把我的名字印在上面。