英语语法分析

Photocells are also used in photometry and spectroscopy.

光电管也应用于光度学和光谱学。

The contents of collagen in mice back skin were measured by photometry.

取背部皮肤，用分光光度法测定小鼠皮肤中胶原蛋白的含量。

It may be useful for surface photometry on plates without sensitometer spots.

这种方法可以用于对没有感光斑点的底片作面光源测光。