但是，简单性作为构造概念结构的指导原则，并不是一个清楚而毫不含糊的观念，它完全可能提出双重的或多重的标准。

But simplicity, as a guiding principle in constructing conceptual schemes, is not a clear and unambiguous idea; and it is quite capable of presenting a double or multiple standard.

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提出了双重抗震结构体系，讨论了其抗震设防目标和设计原则。

The dual seismic resistant structure system is proposed, and its design strategy is discussed.

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