an expert
Tomás dijo no ser un experto.
Tomás said he wasn't an expert.
I thought you were an expert.
I'm not an expert either.
Necesito hablar con un experto.
I need to speak with an expert.
Sólo falta un experto en galimatías.
All that's missing is an expert in gibberish.
— Atlantis: El imperio perdido (2001)
El juez ha pedido a un experto que lo aclare.
The judge has asked an expert to clarify it.
— Anatomía de una caída (2023)
Soy un experto en el Oráculo del Sur.
I am an expert on the Oracle of the South.
— La historia interminable (1984)