一些科学家说，不能仅仅因为现代非洲猎人跑得过猎物，就能证明我们的祖先也跟他们一样。
Some scientists say just because modern African hunters run down prey doesn't prove our ancestors did.
著名科学家、研究学者艾萨克·牛顿爵士有这样一句名言：“如果说我看得比别人远一些，那是因为我站在巨人的肩膀上”。
Sir Isaac Newton, famous scientist and researcher, is credited with the words: "If I have seen further it is by standing on the shoulders of giants."
作者说他是个自然学家而不是个科学家，因为他认为他缺少科学家所需具备的一些品质。
The author says that he is a naturalist rather than a scientist probably because he thinks he lacks some of the qualities required of a scientist.
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