Mr. Koyamauchi is my best friend.

I have been to Neijiang City in Sichuan Province.

This lumen is a path for blood to flow.

He collapsed from intracerebral hemorrhage.

The inner core of the Earth is mainly composed of iron and nickel.

He was struggling to understand his internal language.

His native language is Spanish.

This bacterium produces a powerful endotoxin.

Mr. Uchitomi is my best friend.

There is a great advantage to receiving tutoring at the teacher's home, as it allows for one-on-one instruction.