Someone who knows the program well should examine the bugs and understand their root causes, since bugs must be eliminated at their source.
因为必须要在源代码中消除错误，所以，应该有一个精通程序的人来检查错误，并知道这些错误的根本原因。
2
In general, if software is not written to be maintainable, then even if it works to begin with, sooner or later you (or someone else) will end up breaking it trying to fix bugs or add new features.