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311---描述一个findings,并介绍通过这个findings scientists发现了什么
生词:looter 掠夺者 metallurgy治金学 alloy合金
---介绍背景---
Metals in PA---first evidence
---illustrate a way to recreate the past even when looters have destroyed the artifacts (for instance, a tax to force a switch (from copper to silver))
---插入说一下artifacts不足以证明history---
Artifacts previously have been found, but unclear about how PA developed, or whether or not artifacts came from PA.
CC: “there’re a lot cannot tell because there’re a lot looting.”
---回归说明如何recreate, 并发现metallurgy---
To recreate: scientists measure xxx, xxx ---collecting samples over two summers=== remote PA was challenging
The mentals(findings): each linked with metallurgical practices
Use carbon dating and lead isotope dating---when---found the earliest dated back to 1000-1200AD---aimed toward copper and copper alloy
CC:“ it’s curious and strange about when it occur”
----transition to silver---
Wari collapsed, metallurgy spread after collapse, but where it came from still unknown
After 1450AD, villages switch from copper to silver—when rules imposed a tax
最后就是CC讲希望能help reconstruct the history of metallurgy----也就是说他们还没有完全完成研究,只完成了一部分。
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