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它其实是那个方向的方向导数。
Well, it's actually the directional derivative in that direction.
youdao
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我们来用方向导数,来描述一下相同的东西。
Let's say the same thing in terms of directional derivatives.
youdao
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我们来用方向导数,来描述一下相同的东西。
Let's say the same thing in terms of directional derivatives.
youdao