first derivative造句

1、Methods First derivative spectrophotometry was used.
方法一阶导数分光光度法。

2、That's the first derivative of the position versus time.
它就是位置，对时间的一阶导数。

3、A mark used as a superscript to indicate the first derivative of a variable
撇号置于右上角的符号，用以标明变量的第一个导数

4、And I can take now the first derivative of this.
现在得到第一个推导式。