结果表明：空气弹簧的刚度不仅与其静平衡位置时的压力和容积有关，还与其有效面积变化率和体积变化率有关。

The results show that the stiffness is dependent not only on the pressure and volume at static balance, but also on the change rates of efficient area and volume.

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结论面积变化率的测量有助于评估asd患者右心室功能，并可全面掌握ASD大小，有利于临床医生进行ASD封堵或手术。

Conclusions the measurement of area change percentage is helpful to learn the RV function in ASD patients and the size of ASD which was beneficial to ASD occlusion or operation.

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比如，微积分是从斜率，面积和变化率等等话题中引入的。

For instance, calculus is usually first introduced interms of slopes, areas, rates of change, and so forth.

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