求翻译：For example, the following sequence of observations of soil behavior have lead to improved models: Effects of virgin(primary) loading and unloading-reloading, confining pressure, stress path (stress history), intermediate principal stress, instability (leading to shear banding in dense sand and overconsolidated soils and to liquefaction in loose silty sands), anisotropy, and stress rotation (note: this list of phenomena is not exhaustive). While all of these (and many more) effects have been known to exist for some time, some of them are still to be researched and understood in detail before they may be modeled correctly. Thus, the simple models can only handle the first mentioned phenomena, while the more advanced models may handle additional phenomena. It is difficult to say that any one of these phenomena has definitively been researched, understood, and included in any given model. The latter two topics (effects of anisotropy and effects of stress rotation) are in the forefront of current research, and practically applicable models that correctly capture these effects are still to be developed.是什么意思？

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