多重势面模型直接从数学原理出发建立本构关系，避开了传统塑性理论中屈服面的概念，为研究岩土工程材料本构模型提供了新的思路。
The multi-potential surface model in strain space is more practical, since its parameters are easy to be determined, and the program based on the model is easy to be developed.
在很多时候，人们需要从两个人中选出两个人来，还有些时候，这种选举甚至会违背数学原理，要求选民们从两个人中选出三个人来。
Very often people are asked to elect two out of two candidates. Other times, elections even defy basic math—three winners can be elected from two candidates.
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