這種長(cháng)期的系統變化說(shuō)明自然選擇的作用，并表明女性骨骼的特性較大的適應性。但是，情況完全是這樣的嗎？
A systematic long-term change of this kind suggests the action of natural selection and indicates that female skeletal characteristics confer greater fitness. But is this the whole story.
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