求翻译：The professor___37___the lecture hall, placed upon his desk a large jar filled with dried beans, and invited the student to___38___how many beans the jar contained. After___39___shout of wildly wrong guesses, the professor smiled a thin, dry smile, announced the___40___answer, and went on saying, “you have just ___41___ an important lesson about science. That is: Never___42___your own senses.”是什么意思？

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