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- 问题详情：Heathasbeenusedtocontrolhairforhundredsofyears.Buthowmuchistoomuch?Ifyou’veeveropenedaveryhotoven,youknowthatheatcanburnyoureyebrowsoffyourfaceveryquickly.AscientistfromPurdueUniversityinIndianaistryingtofindascientificansweronhowhotistoohot...
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