They crawled when they were babies and walked with two legs before they had to rely on a crutch in old age. 是人，他们刚生下来的时候用四肢爬行，后来用双腿走路，老年时又不得不依靠拐杖走。
People.
They crawled when they were babies and walked with two legs before they had to rely on a crutch in old age. 是人，他们刚生下来的时候用四肢爬行，后来用双腿走路，老年时又不得不依靠拐杖走。
People.