在西方历史上，由于社会形态的频繁更替、社会思潮的不断改变，导致了城市设计模式发生多次演变。
The frequent changes of social forms and social thoughts have led to the evolution of urban design models in western history.
目的了解骨形态发生蛋白-2（BMP-2）在大鼠脑的不同发育阶段，嘴侧神经干细胞迁移流中的表达模式。
Objective To study the expressional pattern of bone morphogenetic protein-2 ( BMP-2) in rostral neural stem cells migratory stream at different time in developing rat brain.
表明，两种细胞可通过形态的变化，发生力学模式的适应性改变来响应机械应力。
The results showed that human pulmonary epithelial A549 and H727 cells responded to mechanical strain by changing their mechanical patterns.
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