另一方面，错误是意外的问题——因为我们事先不知道哪里会出错，我们需要分析实际测试运行中的回溯来诊断这种问题。

Errors, on the other hand, are unexpected problems — since we do not know in advance what can go wrong, we need to examine the traceback in the actual test run to diagnose such problems.

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这个数据可以回溯到对洞穴绘画的研究，人们观察猎人们用哪只手拿武器，以及考古学上对文物的分析。

And this goes back to studies of cave paintings, looking at which hands hunters are using to hold their spears, and to archaeological analyses of ancient artifacts.

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通过基于最终结果执行数据流分析，可以将结果回溯到对生成此结果有影响的所有语句。

By performing a data flow analysis based on the final results, it's possible to trace the result back through all of the statements that contributed to producing it.

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