人类的祖先为什么放弃四肢着地,而选择直立行走呢?有关这个问题的理论可谓五花八门,至今仍无定论。我们从小学习的答案是:失去森林的古猿被迫下到地面生活,为了适应新环境,逐渐学会了利用前肢采集果实、捕捉动物和抓取石块当做武器,以抵御野兽的侵袭。于是,前肢和后肢分工,逐渐进化成了直立行走。但一些科学家认为,直立行走的理由并非如此简单。直立行走是为了节省能量,而新的研究则提出直立行走是由于当时气温太高。 Why did human ancestors abandon their limbs and choose to walk upright? There are so many theories about this issue that so far they are still inconclusive. We learned from an early age that the lost ape was forced to live on the ground. In order to adapt to the new environment, it gradually learned to use forelimbs to collect fruits, capture animals and grasp rocks as a weapon to defend against the invasion of wild animals. As a result, the forelimb and hind limb division of labor, gradually evolved into an upright walk. But some scientists think the reason for walking upright is not that simple. Upright walking is to save energy, and new research suggests that walking upright is due to the temperature is too high at the time.