You take the y component, take the derivative with respect to x, take the x component, differentiate with respect to y, you should get the same answer. And that is important to know.

对y分量，关于x求导，对x分量，关于y求导，应该得到相同结果，这个知识点很重要。

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A new method for determining directly trace component in interfering base by absorbance subtraction -second derivative spectrophotometry is proposed.

对利用差谱—二阶导数分光光度法直接测定强干扰基体中微量组分的原理和实验方法进行了探讨。

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It has become a system in the entire financial market an indispensable component of the derivative transactions has become a measure of a mature financial market is mature signs.

它已经成为整个金融市场体系中不可或缺的重要组成部分，衍生金融工具交易是否成熟也成为衡量一个金融市场是否成熟的标志。

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Its founder, Nicolas Bazan, a 60-year-old neuroscientist, has a seemingly simple and elegant answer to the pain problem: chemically combine a derivative of acetaminophen with a saccharinelike component.

FORBES: Magazine Article

From the looks of it ECRI takes the first principle component of these four variables and then charts the first time derivative.

FORBES: On Lakshum Achuthan and ECRI: This is Becoming Embarrassing for Everyone