透 (tòu): to penetrate, to pass through; thorough

Sunlight came through the curtains, and the room suddenly became much brighter.

He opened the envelope and found that the letter paper inside was already soaked through with water.

This material has good breathability and is suitable for wearing in summer.

His clothes were soaked through by the rain and felt very uncomfortable sticking to his body.

An excited expression showed through on her face; it seemed she had done well on the exam.

Although this perfume is light, its fragrance can penetrate far.