And that's the reason why, as you look at the hominid fossil record, erectus, and heidelbergensis, and floresiensis, and Neanderthals, and Homo sapiens, all overlap.
原因是，当你在看类人猿化石纪录的时候， 直立人，海德堡人，佛罗勒斯人，尼安德特人， 以及智人，都有重叠。