It's difficult to really understand the theory of relativity.
真正理解相对论是不易的。
For us, it's really difficult to understand this kind of life.
对于我们来说，这种生活简直难以置信。
I would really like to read his book, but it's written in ancient Italian, and I'm afraid it would be too difficult to understand.
我真的愿意看他的书，但它是用意大利古文写的，所以我恐怕它是太难懂了。
I would really like to read his book, but it's written in ancient Italian, and I'm afraid it would be too difficult to understand.
我真的愿意看他的书，但它是用意大利古文写的，所以我恐怕它是太难懂了。
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