世界上为什么有不同的肤色？从人类褪毛说起，虱子功不可没https://m.toutiaocdn.com/i6904113334883467776/?app=news_article×tamp=1607498515&use_new_style=1&req_id=2020120915215501012904309303031633&group_id=6904113334883467776&tt_from=android_share&utm_medium=toutiao_android&utm_campaign=client_share
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