proto-

例句：

1. 1. The proto-humans lived in the forest for millions of years before evolving into modern humans.
   原人类生活在森林中数百万年，然后进化成现代人。
2. 2.The proto-humans were the first animals to walk on two legs.
   原人类是第一批两足行走的动物。
3. 3.The proto-humans had a brain that was much larger than that of modern humans.
   原人类的大脑比现代人类的大脑要大得多。