godan verb (-su)
be visible through; be seen through; shine through
Describes something being transparent or translucent enough that what is behind or inside can be seen, or light passing through. Often used for thin fabrics, glass, or clear substances.
薄いカーテン越しに部屋の中が透き通して見えた。
The inside of the room was visible through the thin curtain.
この
This glass lets light shine through well.