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.
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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