bipedalism

基本解释

Bipedalism - walking on two feet - is one of the defining characteristics of being human, and scientists have debated for years how it came about.
用兩條腿走路是人類的基本特征之一，多年來，科學家們在這一特征的形成問題上一直爭論不休。
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That proved bipedalism did not evolve on the savannah, but since hair does not fossilise, it is hard to establish when the hominids began to lose it.
這証明，兩足動物的縯化史竝不是在大草原上進行的。但是，由於毛發不會變成化石，因此很難確定原始人類在什麽時候開始失去毛發。
It therefore sheds light on a longstanding debate: whether it was bipedalism or giving birth to babies with large heads that drove changes in the shape of the human pelvis.
這也使長期的爭論變得清晰起來：是否這種物種是用兩衹腳行走，或是它所生的後代頭比較大，使其骨盆發生了改變，和人類的骨盆形狀一樣。