So the model can reflect structure characteristic and work state of point rail exactly.

使模型较准确的反映了心轨的结构特性和工作状况。

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Air is the gaseous state of matter whose characteristic is mobility.

空气是气态物质其特点是流动性。

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Air is the gaseous state of matter whose characteristic is mobility.

空气是气态物质其特点是流动性。

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