The exact cause of this disease is a matter hard to explain to which we have yet to find an answer.

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Theexactcauseofthisdiseaseisamatterhardtoexplaintowhichwehaveyettofindananswer.Theexactcauseofthisdi

The exact cause of this disease is a matter hard to explain to which we have yet to find an answer.
The exact cause of this disease is a matter hard to explain to which we have yet to find an answer.

The exact cause of this disease is a matter hard to explain to which we have yet to find an answer.
解释疾病发生的确切原因是件很难的事情,我们还没找到答案.