transmittance

This glass has a high transmittance for visible light, so the room stays bright.

用法提示：此处 transmittance 为名词，表示光线透过物质的比率。

We measured the transmittance of the film at different wavelengths in the lab.

用法提示：transmittance 作名词，指辐射穿过物质的分数。

These materials show different transmittances, which affects how much heat enters the building.

用法提示：复数形式 transmittances 表示多种透射率，仍是名词。