坚硬的火山岩是一种多年来需求量很大的资源，至少从奥尔梅克人（一种生活在公元前1200年至400年之间的民族）崛起以来是这样。

The hard volcanic stone was a resource that had been in great demand for many years, at least since the rise of the Olmecs (a people who flourished between 1200 and 400 B.

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此外，最近针对在奥尔梅克遗址发现的黑曜石工具的研究表明，奥尔梅克人获得的一些黑曜石起源于特奥蒂瓦坎附近。

Moreover, recent research on obsidian tools found at Olmec sites has shown that some of the obsidian obtained by the Olmecs originated near Teotihuacán.

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奥尔梅克金字塔，众所周知，没有被挖掘，部分原因是高水位和他们的海湾沿岸土地湿度不利于维护埋葬人的遗骸。

Olmec pyramids, while well-known, have not been excavated, in part because the high water table and humidity of their Gulf coast sites are not as conducive to preserving buried human remains.

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