The underlying problem here is a mismatch between the tester's and the developer's mental models of the program; the tester, on the outside looking in, and the developer on the inside looking out.
更深层的问题是，开发者和测试者的思维模式不同。 测试者是由表及里的看问题，而开发者则是自内而外。
From the outside looking in, it's hard to understand. From the inside looking out, it's hard to explain.
由外向里看，难以理解明白。由里往外看，难以解释清楚。
From the outside looking in, it's hard to understand. From the inside looking out, it's hard to explain.
由外向里看，难以理解明白。由里往外看，难以解释清楚。
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