Therefore, alongside an explanation of the sources of firm differentials, there must also be an explanation of the mechanism of how the differentials persist over time.
因此，在对企业差异来源的解释之外，还应该有一个对这些差异如何随着时间而持续下去的机制的解释。
We also agree we must find ways to manage our differences with Russia where they persist and stand firm where our principles or our vital interests are at stake.
我们还一致认为，我们必须寻求管理我们同俄罗斯之间长期不能解决的不同，在涉及原则和重要利益的时候，我们立场坚定。
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