原题
Archaeologists typically study human history and prehistory through the excavation of artifacts buried underground. Sometimes, how, they disc artifacts subm underwater. A stone wall w found ben the Baltic Sea i 2012 th dates t over 10,000 ye ago. Resea believe it was used by hunter-gatherer societies to guide and trap reindeer. The wall consists of approximately 1,670 stones and is considered one of the oldest documented hunting structures made by humans.
参考答案：ever over erged as eath n at o ars rchers
解题思路
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