You can therefore evolve a spec with new elements and constraints without impacting or forcing a migration of product data.

因此，您可以使用新的元素和约束来使spec发生演变，而不会对产品数据产生影响或实施迁移。

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The two repeated the strategies they used to defeat Warren, although on a larger scale and with new elements.

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At the same time, Facebook wants to still be able to experiment with new design elements.

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With these new elements, the List of Intangible Cultural Heritage in Need of Urgent Safeguarding now comprises 16 elements.

UNESCO: CULTURE