问题描述：
I am your son.But you are not my mother.Who are you?( )
When you walk,we are always with you.When you sleep,we are away from you.We are twins all the time.What are we?( )
When you walk,we are always with you.When you sleep,we are away from you.We are twins all the time.What are we?( )
问题解答：
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