One day a mathematician decides that he is sick of math. So, he walks down to the fire department and announces that he wants to become a fireman.
一天一个数学家认定他已经对数学厌倦了。所以,他去消防队说他想成为一个消防队员。
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The department of medical backbone most 20 to 30 years, experienced, skilled, noble medical ethics, has won praise and the social from all walks of life.