Methods: Ultrastructural morphology and quantitative changes of left atrium and left ventricle of male rats were observed by electron microscope.

方法：取健康雄性大鼠，电镜观测左心房和左心室细胞超微结构的形态和定量变化。

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Objective To develop a morphology research on the quantitative evaluation indexes for skin aging of the dorsal hand.

目的：开展手背部皮肤老化形态学定量评价指标的研究，为客观评价皮肤老化提供手段。

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The morphology of Si phase has a remarkable effect on mechanical properties of Al Si alloy by quantitative metallographical measurement and regression analysis.

通过定量金相测量及回归分析，硅相的形态对合金的力学性能影响显著。

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