问题描述：
英语翻译
Once there were three old men．They were very forgetful．They always forgot what they were doing．One of them said,“I often forget if I should put something in or take something out of the fridge as soon as I open its door．
The second old man said,“I always wonder if I have just come upstairs or am going downstairs when I am standing on the landing．
“I am even more forgetful than both of you,”said the last old man,and he knocked on the table．Then he turned to the other two men and asked,“Who just knocked on the table?
Once there were three old men．They were very forgetful．They always forgot what they were doing．One of them said,“I often forget if I should put something in or take something out of the fridge as soon as I open its door．
The second old man said,“I always wonder if I have just come upstairs or am going downstairs when I am standing on the landing．
“I am even more forgetful than both of you,”said the last old man,and he knocked on the table．Then he turned to the other two men and asked,“Who just knocked on the table?
问题解答：
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