Those hands were shaping stone tools; tools that represent the first step on the great journey of shaping our world.

那双手在塑造石质工具，它们象征着人类改造世界伟大征程的第一步。

Sometimes that polishing was part of shaping the tool, but at other times it was purely for aesthetic or even symbolic reasons.

有时候这种润色是塑造工具的一部分，但有时候纯粹是出于美学或甚至是象征性的原因。