在散度定理中的约定是,将曲面的定向取为外法线的方向。
The convention in the divergence theorem is that we orient the surface with a normal vector pointing always outwards.
根据渐近曲线的方程，具体给出主法线曲面的一族非直线的渐近曲线。
According to the equation of asymptotic curves, a family of nonlinear asymptotic curves are given to the principal normal surface.
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