Understanding the rules of 'Ha-gyou tenko' is difficult.

Naruka is my best friend.

He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

He has a deep interest in paleozoology.

The tensor tympani is a muscle located in the middle ear that regulates the tension of the eardrum.

Cyanocobalamin is a type of vitamin B12.

I'm looking forward to filming a movie with my new camcorder.

I visited the Côte d’Azur during my summer vacation.

He is an expert in international relations.

This old house is the one where my grandparents lived.