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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But with great success comes greater responsibility, to modify the old axiom.

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If one was able, they could modify skins in the old battlefield series, or modify buildings in the older SimCity titles.

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Its response was to forbid public companies, after July 30, 2002, to make or even arrange new loans to executives or to modify or renew old ones.

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