Krech 断言广泛的气候变化确实发生在更新世末期，这与 Martin 排除气候变化作为解释的观点相矛盾。
Krech also contradicts Martin's exclusion of climatic change as an explanation by asserting that widespread climatic change did indeed occur at the end of the Pleistocene.
有几种假说试图解释这种疾病的爆发，但没有一种假说是正确的，因为它们相互矛盾。
There are several hypotheses trying to explain that outbreaks but none have elements of the truth because they contradict each other.
但我不认为这些因素中的任何一个可以解释这个矛盾。
But I can't think why either of those factors could explain the disparity.
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