Hearing a scream from the playroom, the mother rushed in and found her infant daughter pulling the hair of her four-year-old bother. After separating them, the mother said to her son, “Don’t be upset with your sister, honey. She didn’t know she was hurting you.”
No sooner had the mother returned to her chores than she heard more screaming. This time she rushed in and found the baby crying. “Now what happened?” she asked.
“Nothing,” said the boy, “except that now she knows.”

    听到从娱乐室传来一声尖叫声,母亲冲了进去,看到她的女婴正在拉扯她四岁的哥哥的头发.母亲分开了他们,对儿子说,"不要和你妹妹生气,宝贝. 她不知道弄痛了你."

    母亲回去做家务,还没多久,听到一声更响的尖叫声传来. 她又冲进去,这一次她看到女婴在哭."又发生什么事了?" 她问.

    "什么也没发生,"男孩说,"除非她现在知道."