The problems you can't fix always seem to occur on one user's machine in the field, with no debugging environment and no way to figure out the cause.

你不能修复的问题看起来会发生在某个用户的机器上，没有调试环境，也没有方法来查找原因。

youdao

No one is as yet ready to start debugging a mass manufacturing operation.

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If there was a Basic program that was written with the complexity of the IRC, I am sure that not only would the program not have worked, but if from this moment forward, no new features were added to it and all programming effort was devoted to debugging the existing code, it would certainly take centuries to debug.

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