Two critical advances were bipedalism and encephalization.

两个关键进展，两足行走和脑的发达。

youdao

The debate over the origins of human bipedalism has been argued since Charles Darwin's day, dividing into two competing models.

围绕人类两足行走起源的争论从查尔斯·达尔文时代就开始了，分为相互不让的两种模式。

youdao

'the debate over the origins of human bipedalism has been argued since Charles Darwin's day, dividing into two competing models.

围绕人类两足行走起源的争论从查尔斯·达尔文时代就开始了，分为相互不让的两种模式。

youdao

Foot bones from the species Ardipithecus ramidus and Ardipithecus kadabba have features diagnostic of bipedalism.

BBC: NEWS | Science/Nature | Scientists unearth early skeleton

Bipedalism is a crucial aspect of the human form, palaeoanthropologists believe - but there is a great deal of debate about when exactly this ability first arose in our lineage.

BBC: NEWS | Science/Nature | Scientists unearth early skeleton