first curvature vector [数] 第一曲率向量
absolute first curvature [数] 绝对曲率
first curvature radius 第一曲率半径
By using the method of boundary layer, it discusses the axis symmetry problems of the combines rotary shell when its first curvature is in constant.
利用边界层方法，讨论了第一主曲率为常数的组合旋转壳的轴对称问题。
When it is curved, the law of its curvature seems to be at the least of the first and at the most of the second order.
当它是曲线的时候，其弯曲的法则看起来至少是一阶至多是二阶。
In this paper, we first polygonize the scattered data points, then estimate the normal vector and curvature of each point using the local presentation of data points.
首先对获得的散乱数据点云进行多边形化，然后根据数据点局部表示对每点的法矢和曲率进行估算。
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