light concentration

• 低浓度

light concentration的用法和样例：

例句

1. Titanium is useful at low concentration only.
   钛只在低浓度时起作用。
2. A low concentration second conductive type diffusion region is formed in a photodiode region.
   低浓度的第二传导类型扩散区形成于光电二极管区中。