如果进化一直以来都是一个持续的、渐进的过程，人们可能会认为，几乎每年的化石样本都会存在细微的差别。
If evolution had been a continuous, gradual process, one might expect that almost every fossil specimen would be slightly different from every year.
如果属实，那就应该有可能找到从观察模仿我们的灵长类近亲用叫声或手势交流而逐渐进化到人类语言过程的痕迹。
If so, it should be possible to find clues about how human language evolved from grunts or gestures by observing the communication of our close primate relatives.
果真如此，古代原始人的行走进化过程很可能是一日千里，而非循序渐进。
If so, walking may have evolved in leaps and bounds, rather than gradually, among ancient hominids.
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