A decade ago most ethylene in North America was made using naphtha, an oil derivative: it is this process that has propylene as its by-product.

十年前，北美的大多数乙烯是石油脑(一种石油衍生物)所制：其生产过程所产生的副产物正是丙烯。

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LVMH also holds derivative instruments over some Hermes shares and intends to request their conversion. Once that process is complete, LVMH will hold 17.1% of Hermes' capital.

路易·威登集团还持有爱马仕股份的金融衍生工具，打算把这部分资产转为股权，如果完成转换过程，路易·威登将持有爱马仕集团17.1%的股份。

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Derivative action (referred to by the letter d) measures and responds to the rate of change of process signal, and adjusts the output of the controller to minimise overshoot.

微分动作(字母d表示)测量并对过程信号变化率进行反应，调整控制器的输出以达到最小的突出峰。

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OK, so for a constant volume process, du we can write du, partial derivative of dT u with respect to T at constant V, dT, dv plus partial derivative of u at constant V, dV.

好，对于一个恒定体积的过程，我们可以写出,等于偏u偏T，V不变，加上偏u偏V，T不变。

麻省理工公开课 - 热力学与动力学课程节选