这个问题难以回答。
然而，她们发现这个问题难以回答，因为实验老鼠不断地死掉。
However, they found this difficult to answer because their mice kept dropping dead.
科学难以回答这个问题。不过很可能是因为秋天里人们生存的愿望更强。
Why? Science doesn't know, but it is quite possible that the will to live is stronger in the fall.
在华盛顿听到的对这个问题的回答都是让人难以理解的。
我不理解你为何觉得这个问题如此难以回答。
I can't understand the reasons why you find this question so difficult answer.
要回答这个问题，单凭个人的主观判断显然是难以做到的。
It is hard to answer this question only by someone's subjective judgement.
病人没有说话，但他的表情显示出他难以回答这个问题。
The patient said nothing, but his expression showed that he found it difficult to answer the question.
病人没有说话，但他的表情显示出他难以回答这个问题。
The patient said nothing, but his expression showed that he found it difficult to answer the question.
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