这就是我们现在所说的连续性方程，推导波动方程的必要条件之一。

This is what we now call the equation of continuity, one of the relationships necessary for the derivation of the wave equation.

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引言：连续性的病人护理是成功运行创伤手术服务必不可少的先决条件。

INTRODUCTION: Continuity of patient care is an essential prerequisite for the successful running of a trauma surgery service.

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本文的目的是研究一些典型的NURBS曲面的几何连续条件，指出节点向量和曲面片的次数对几何连续性的影响。

The aims of this thesis are researching some typical NURBS surfaces' geometric continuous conditions and pointing out the effects of knot vector and the degree of surface on geometric continuities.

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