新的主题，粉红色和可爱的心。
纵观历史，人类的头发一直是虚荣心、科学研究和刻板印象的主题。
Throughout history, human hair has been the subject of much vanity, research, and stereotyping.
纵观历史，人类的头发一直是虚荣心、科学研究和刻板印象的主题。
Throughout history, human hair has been the subject of much vanity, research, and stereotyping.
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