英语语法分析

Selenium is a photoconductive substance.

硒是一种光电导物质。

For longer wavelengths a number of extrinsic photoconductive devices exist.

对于更长的波长，有许多非本征光电导器件可用。

Phthalocyanine compounds is a new kind of organic photoconductive materials.

酞菁类化合物是一类新型的有机光电导材料。