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What is the connotation joke of Snow White Sprite?

A couple quarreled, but the man couldn't win, and the woman was lying in bed, motionless. The woman asked, "What are you doing in bed"? The man replied, "dead"! The woman asked again, "Why are you still open when you are dead?" Die unsatisfied! The man replied, and the woman asked, "Why are you still breathing?" ? The man said, "I can't swallow this tone." .