When you modify old code you have to both test your changes and then perform a set of regression tests to make sure you didn't break any of the existing code.
而当你修改旧有代码时，你不得不既要测试你更改的部分，还要进行一系列的兼容测试，以保证你没有破坏任何的旧有代码。
When you modify old code you have to both test your changes and then perform a set of regression tests to make sure you didn't break any of the existing code.
而当你修改旧有代码时，你不得不既要测试你更改的部分，还要进行一系列的兼容测试，以保证你没有破坏任何的旧有代码。
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