It's difficult to answer this question.
回答这个问题太难了。
I found it a bit difficult to answer this question.
我发现这个问题有点儿难回答。
Since we have no mechanical picture of the ether, it is extremely difficult to answer this question.
因为我们没有以太的力学结构，所以很难答复这个问题。
Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here.
喔，这个问题很难回答，因为我们通常用来描述一种科学现象的术语用在这里不合适。
Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here.
喔，这个问题很难回答，因为我们通常用来描述一种科学现象的术语用在这里不合适。
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