An absent-minded professor was lecturing on anatomy（解剖學）.

"To show you more clearly what I mean, I have here a parcel（包裹） with a dissected frog. I want you to examine it very carefully."

The professor unwrapped the parcel and saw that it contained two sandwiches and a hard-boiled egg. Astonished, the professor said, "I was sure I had eaten my lunch, but where is the frog?"

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都是為了錢

我都知道了