中國(guó)網(wǎng)站品牌欄目（頻道）
A six-year-old comes crying to his Mother because his little sister pulled his hair.
"Don't be angry," the Mother says, "Your little sister doesn't realize that pulling hair hurts."
A short while later, there's more crying, and the Mother goes to investigate.
This time the sister is bawling and her brother says...
"Now she knows."
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