In this view , adaptations to bipedalism restricted the width of the birth canal and , hence , the size of the baby that can pass through it .
按照这种观点,人类向直立行走的动物进化时限制了产道的宽度,以致婴儿的体型不能通过产道。
Also , she was capable of walking on two feet despite living in an area of woodland and forest & a finding that downplays the importance of open grasslands to the evolution of human bipedalism .