科研之友
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摘要
<正>A three-year-old little girl showed her hand to her mother and said,"Look at the fly I killed,Mommy."Since she was eating a piece of toast at the time, her mother asked her to wash her hands.After she sat down to finish her toast, her mother asked,"How did you kill that fly all by yourself?"Between bites, she said,"I hit it with my toast."
