1.  differential coefficient
2.  derivative

• 1. 导数: derivative | differential coefficient
• 2. 方向导数: directional derivative | directional | Richtungsableitung
• 3. 李导数: Lie derivative

更多释义

• 1.我们再求一次导数，也就是对导数求导。
  Let's sneak in one more derivative here, which is to take the derivative of the derivative.
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• 2.那么，那个方向的导数是什么呢？
  And then, what's the derivative in that direction?
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• 3.它只有关于每个变量的偏导数。
  It has only partial derivatives for each variable.
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