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题目材料：
It must be acknowledged that data on ceramic artifacts do not provide the complete picture of regional economic interactions in the ancient Basin of Mexico. First, patterns of exchange between settlements cannot be understood purely through chemical compositional analysis, even when pottery provenance can be securely determined: compositional data do not indicate exactly how pots moved from one place to another or how many times a vessel was exchanged. In addition, ceramics are not the only kind of material that was exchanged between settlements. The transport of bulky and breakable ceramic pots was costly, and clay resources were widely available. Therefore, the orbits within which most ceramics circulated are likely to have been smaller than those of artifacts made from more durable materials, such as obsidian.
以上解析由 考满分老师提供。
