1. There must be a snag in it somewhere.
    一定是在某处出了个小故障.

2. Now the snag in this sort of anecdote is of course that one cannot distinguish cause and effect.
    当然, 这类奇闻中的疑难处当然在于人们无法区别因与果.

3. Now the snag in this sort of anecdote is of course that one cannot distinguish cause and effect. Was the noise a cause of the illness, or were the complaints about noise merely a symptom?
    这类奇闻的疑难之处是无法区别因果关系。是噪音引起了（精神）病呢，还是（精神）病的症状之一是对噪音的抱怨？