Furthermore, the designs were covered with "desert varnish", a glaze that develops on rock surfaces over thousands of years of exposure to the elements.

此外，这些设计还覆盖有“沙漠清漆”，一种在岩石表面经过数千年在这些元素暴露下而形成的釉料。

youdao

As I said before, you can find rock art all over the world, but I'd like to focus now on the rock art of the Aboriginal people of Australia.

就像我之前说的，世界各地都有岩石艺术，但是我现在想要关注的是澳大利亚土著人的岩石艺术。

youdao

I stumbled over a rock.

我在石头上绊了一下。

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