A：哦，原来如此。 Español: Oh, lo veo.

Ah, ya.

There are three ways of communicating "Oh, I see.": 1. "Ah, ya veo." (more literal) 2. "Ah, entiendo." (meaning= "I understand") 3. "Ah, vale." (meaning= "Okay." This is common in Spain.)

Eso es