英语语法分析

Work out their content by unit absorptivity.

再利用单位吸光系数换算其含量。

So it is necessary to determine the laser absorptivity of ductile iron.

因此，确定球墨铸铁材料对激光的吸收率十分必要。

In fact, measured molar absorptivity is also related to apparatus used.

实际上，测得的摩尔消光系数也和使用的仪器有关。