He is interested in the culture of foreign countries.

He is from a grand duchy.

His research is mainly about the ancient Chinese Kyūjitai form of 国号.

He was fascinated by the beautiful scenery of the southern country.

Yesterday, the President of the United States visited Japan as a state guest.

My grandfather was born in Russia.

I want to go to Uenokuni.

Japan adopted a policy of national isolation during the Edo period.

I learned about the Ryukyu Kingdom in history class.

Electroporation is a biotechnology technique that creates temporary holes in the cell membrane to incorporate substances into the cell.