One day, a little  boy  walks to her mother and look at her mother's hair and sadly said: "Why are some of your hair white, mom?"

　　The mother replied, "Well, every time that you do something wrong and make me cry or unhappy, one of my hairs turns white.

　　The boy thought about this revelation a while, and then said, "Momma, how come *all* of grandma's hairs are white?"

Key  words：

turn　（v.）變

revelation　（n.）新發現　click  發音