Bipedal locomotion in humans frees the hands for grasping and manipulation.

人用两足行走，双手得到解放，可以用来抓握和操作。

youdao

Bipedal locomotion in humans frees the hands for grasping and manipulation.

人用两足行走，双手得到解放，可以用来抓握和操作。

youdao