In fact, our social norms are usually unwritten codes of conduct, and they change over time as we as a society change and learn.

事实上，我们的社会规范通常是不成文的行为准则，而且会随着社会的变迁而改变。

These women, so swift to kindness, so tender to the sorrowing, so untiring in times of stress, could be as implacable as furies to any renegade who broke one small law of their unwritten code.

这些女人能嘱苦耐劳，乐且助人，富有同情心，但是如果谁对她们的不成文法规稍有违反，她们是毫不留情的。