That corresponds to normal vector pointing up.

那相当于法向量指向上。

youdao

OK, and that's going to be the normal vector to the surface or to the tangent plane.

这就是切平面的，或者说这个曲面的法向量。

youdao

That is our convention to get a unit normal vector that points to the right of the curve as we move along the curve.

这是约定的得到单位法向量的方法，这种做法使得，当沿着曲线行进时，法向量始终指向右手方向。

youdao