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？
So, the level curve corresponding to zero is actually two diagonal lines.
0的等高线实际上是两条对角线。
So, well, maybe we want to understand first what happens if we move inside the level curve, OK?
我们首先要理解,移动到等值曲线的内部会发生什么？
OK, and so we repeat the process with maybe z equals two, and we get another level curve, and so on.
我们对z=2重复这个过程，就得到另外的等高线，如此种种。
Their variations are consistent with the sedimentary facies and the sea level curve, showing a good response to the sedimentary environment.
在垂向上，碳、氧同位素的变化与沉积相演化和海平面曲线相吻合，说明它们与沉积环境的演化密切相关。
Their variations are consistent with the sedimentary facies and the sea level curve, showing a good response to the sedimentary environment.
在垂向上，碳、氧同位素的变化与沉积相演化和海平面曲线相吻合，说明它们与沉积环境的演化密切相关。
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