One key indicator of change in the environment surrounding these prehistoric settlements is the wood that was used there.
这些史前定居点周围环境变化的一个关键指标是当地曾使用的木材。
A major question in the archaeology of the southwestern region of the United States is why so many impressive settlements, and even entire regions, were abandoned in prehistoric times.
美国西南地区考古的一个主要问题是，为什么这么多令人印象深刻的定居点，甚至整个地区，在史前时代就被废弃了。
Major question in the archaeology of the southwestern region of the United States is why so many impressive settlements, and even entire regions, were abandoned in prehistoric times.
美国西南地区考古学的主要问题是：为什么这么多不俗的定居点，甚至整个西南地区，都在史前时代被遗弃了呢？
Major question in the archaeology of the southwestern region of the United States is why so many impressive settlements, and even entire regions, were abandoned in prehistoric times.
美国西南地区考古学的主要问题是：为什么这么多不俗的定居点，甚至整个西南地区，都在史前时代被遗弃了呢？
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