1、Methods First derivative spectrophotometry was used.
方法一階導(dǎo)數(shù)分光光度法。

2、That's the first derivative of the position versus time.
它就是位置，對(duì)時(shí)間的一階導(dǎo)數(shù)。

3、A mark used as a superscript to indicate the first derivative of a variable
撇號(hào)置于右上角的符號(hào)，用以標(biāo)明變量的第一個(gè)導(dǎo)數(shù)

4、And I can take now the first derivative of this.
現(xiàn)在得到第一個(gè)推導(dǎo)式。