Few frames of reference were available to the public.

没有向公众提供什么参照系.

The Multiple Frames of Reference (MFR) method was adopted for the simulation.

流动场的计算采用多重参考系法。

They mean something only with respect to arbitrarily chosen, artificial frames of reference.

它们的意义只存在于任意选中的人工参照系中。

However, as far as residential buildings are concerned, the correct relative order of importance depends on the frames of reference used.

然而，就居住建筑而言，关于风险重要性正确的相对排序取决于所使用的参照框架。