[SC求助］OG一个句法题的长难句翻译

ENJ0Y

OG 2015， P97，41题

Excavators at the Indus Valley site of Harappa in eastern Pakistan say the discovery of inscribed shards dating to circa 2800-2600 B.C. indicates that the development of a Harappan writing system, the use of inscribed seals impressed into clay for marking ownership, and the standardization of weights for trade or taxation occurred many decades, if not centuries, earlier than was previously believed.

正确句子已替换进原文中，请教各位大神这句话的中文翻译。感谢！

ENJ0Y

感谢

ENJ0Y

elusive 发表于 2016-4-13 07:38
挖掘者们在东巴基斯坦的印度河谷的Harappa现场说一个可以追溯到公元前2800-2600年的带有铭文的碎片的发现表 ...

非常感谢！