U That means my vector u, well, approximately because I am using this linear approximation.
这意味着向量，约等于…，因为用了线性近似，约等于。
You'll see why very soon, in such a way that the derivative is this given unit vector u hat.
你很快就会明白为什么,导数dr/ds等于给定的单位u向量。
We'll be slicing things by a plane that is now in the direction of this vector,u and we'll be looking at the slope of the slice of the graph.
用沿着向量方向的平面,切开图像,然后看图像的剖面图，找出斜率。
We'll be slicing things by a plane that is now in the direction of this vector,u and we'll be looking at the slope of the slice of the graph.
用沿着向量方向的平面,切开图像,然后看图像的剖面图，找出斜率。
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