古印度河文明是如何消亡的？
也许是因为最初的地面在水平面以下，我们已没法挖掘埋藏在地下的印度河文明城市的最初踪迹。
All trace of properly laid-out burial grounds is lacking, probably because the earliest strata are below water level and it has so far been impossible to excavate them.
印度河文明早期文字的正式书写体系也在此时诞生，从陶器碎片上和图章在黏土上盖出的印记里，都可以证明。
A formal writing system, known as the Early Indus script, emerged in this phase, as evinced by its appearance on numerous pottery fragments and in impressions that a seal, or stamp, made in clay.
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