When humans began to express themselves artistically, in the late Paleolithic era, they drew hunts of large animals on the walls of caves.

在旧石器时代晚期，人类开始艺术性地表达思想，在岩洞里描绘了大量大型动物的形像。

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The rationale for this is that natural selection has adapted Paleolithic humans to the food in that era.

对于这种饮食产生的原因是，旧石器时代人类通过自然选择已经适应了那个时代的食物。

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Back in the paleolithic web era known as the late 1990s, those of us doing client-side development had things pretty rough.

回到早期网络时代，就是20世纪90年代后期，我们这些做客户端开发的人面前困难重重。

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Back in the paleolithic web era known as the late 1990s, those of us doing client-side development had things pretty rough.

回到早期网络时代，就是20世纪90年代后期，我们这些做客户端开发的人面前困难重重。

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