However, neither major element nor trace element geochemical characteristics can be explained by a simp le model of magmatic origin.
但是，无论是主元素还是痕量元素地球化学特征，均不能用单一的岩浆成因模型得到解释。
This paper puts forward a simp le model designing method.
文章提出了一种简便的模型设计法。
The SIMP method and the heat conduction analyze model are integrated to formulate topology optimization model of heat radiation structures.
运用密度惩罚法和热传导分析模型研究了散热结构拓扑优化模型。
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