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。
It is asking us to find somehow to combine that vector and this one in the right amount, to get that one.
问我们怎么样来组合切当数量的这个向量已经那个向量来得到那边那个向量。
It is asking us to find somehow to combine that vector and this one in the right amount, to get that one.
问我们怎么样来组合切当数量的这个向量已经那个向量来得到那边那个向量。
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