在公元前200年以前，在墨西哥峡谷内部及周边有很多相对较小的城镇中心共存着。
Prior to 200 B.C., a number of relatively small centers coexisted in and near the Valley of Mexico.
谷内把信折了起来，他觉得这一切都来的太快了。
Furuuchi folded the letter up and thought it all seemed premature.
峡谷内罗列着绿色的农场，并点缀着灰色的市镇。
The valley is checkered with green farm fields and dotted with gray cities and towns.
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