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This is the level curve maybe f equals something.
这个就是f等于某个数字的等高线。
youdao
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Do you mean how do I know that it is perpendicular to a level curve?
你想问的是，我如何知道它是和等高线垂直的吗？
youdao
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Do you mean how do I know that it is perpendicular to a level curve?
你想问的是，我如何知道它是和等高线垂直的吗？
youdao