源泉种的大脑像猩猩一样，为420立方厘米——对南方古猿来说，这不算什么稀罕。
Its size is a chimplike 420 cubic centimeters—not at all unusual for something called Australopithecus.
如果距今200万年的南方古猿源泉种确实是人属的真正祖先，它怎么可能繁衍出比尔·吉姆贝尔（威廉·吉姆贝尔？） 鞋盒子中距今历史更长的化石人属？
If two-million-year-old A. sediba is indeed the true ancestor of Homo, how could it give rise to those even older fossils assigned to Homo in Bill Kimbel's shoe box?
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