He is an expert in international relations.

This old house is the one where my grandparents lived.

Shiho cannot sleep when she drinks coffee.

He always keeps in mind the phrase 'If one learns without thinking, it is a waste.'

Aine is my best friend.

He is suffering from acquired immune deficiency syndrome (AIDS).

She was diagnosed with polycystic ovary syndrome.

I have been to Amami.

What are the indications of that disease?

His loyalty is so great that everyone acknowledges it.