and so the tools of long ago have remained when even the bones of the men who made them have disappeared without trace.

因此，尽管制造这些工具的人的骨头早已荡然无存，但远古时代的石头工具却保存了下来。

Before it becomes a retirement village,

在硅谷变成一个退休村之前，

some snakes manufacture a poison different in every respect from that of others,

有些蛇产生的毒液也在各方面与另外一些毒蛇产生的毒液不同，

And then, when they were dead, the carnivores, like the sabre-toothed cats and the giant wolves, came out to feed and suffered exactly the same fate.

大象死后，一些食肉动物，如剑齿虎和大灰狼就来吃大象，结果遭到了同样的命运。

the cost of managing and administering the business.

企业行政管理费。

Although an ocean wave gives the impression of a wall of water moving in your direction,

虽然，海浪给人的印象是一堵由水组成的墙向你压过来，