# 另一種完全相反的觀點,稱為替代理論(replacementtheory),講的是雙方水火不容、互有反感、甚至是種族滅殺。根據這一理論,智人與其他人種的生理結構還是有所不同,不僅交配習性難以相合,甚至連體味都天差地別。——《人類大歷史》
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