The next day the silcrete had become a deep red colour and was easily flaked.

第二天，砾岩石已经变成了深红色，并且很容易制成片。

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None of the material used to make these advanced tools matched local silcrete outcrops.

制造这些高级工具的材料中并没有能与当地的硅结砾岩地表岩层相匹配的。

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Using the heated stone, the researchers were able to produce realistic copies of silcrete tools.

用这种加热过的石头，研究人员得以造出砾岩工具的复制品。

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