Over time, intense bursts of bipedal activity may have led to anatomical changes that in turn became the subject of natural selection where competition for food or other resources was strong.

久而久之，双足活动的强烈爆发可能导致了解剖学上的变化，因此这种变化也就成为自然选择的主题，在那种情况下，对食物或其他资源的争夺是十分激烈的。

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Over time, intense bursts of bipedal activity may have led to anatomical changes that in turn became the subject of natural selection where competition for food or other resources was strong.

久而久之，双足活动的强烈爆发可能导致了解剖学上的变化，因此这种变化也就成为自然选择的主题，在那种情况下，对食物或其他资源的争夺是十分激烈的。

youdao