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婴儿高兴的时候,看见一只狗吐着舌头,他会哈哈大笑;而看见你把鼻子沾上面粉,装扮成马戏团的小丑,他也许会哭。一个18个月大的婴儿会每6分钟笑一次.而成年人平
When the baby was happy, he saw a dog vomiting with a tongue and he laughed; and seeing you clutching your nose with a clown dressed as a circus, he might cry. An 18-month-old baby laughs every 6 minutes while adults are flat