你看,我有我的方向!
I meet you in the night of the sea, you have to you, I have my direction.
你我相逢在黑夜的海上,你有你的,我有我的,方向。——徐志摩。
And, I have the graph of my function — and I'm asking myself how quickly does the value change when I move on the graph in that direction?
有这样的函数图像-,当沿着图像上的这个方向变化时,试问函数值变化的有多快?
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