回複：oh yeah? you need to know where the bugs are first

I explained to you before. Software bug is caused by incorrect logic written by the software developers. When the user reported a problem, the developer can look at the software code that is related to the complaint. There is no way that the developer can not see which code that caused the problem. Remember there may be hundred of thousands of lines of code. But each section is written to handle different things. The developer does not need to check all sections. That is why in modern software developing they emphasis localization.