炙热的舞台灯光下，魔术师王显波拿出6个金属圆环，将它们一个个相互碰撞，然后连成了不同形状：花朵，人力车，飞机等等。

Sweating under stage lights, magician Wang Xianbo takes six metal rings, bumps them together one by one and then links the rings into shapes: a flower, a rickshaw, an airplane.

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建立了493车用柴油机缸孔变形的整体接触关系模型，提出了缸盖垫的非线性组合模型及缸套圆环模型。

An integral contact model was established to analyze the cylinder bore deformation of model 493 automotive diesel engine.

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