He contracted severe invasive streptococcal disease and underwent emergency surgery.

The National Research and Development Agency plays a crucial role in advancing science and technology.

We traveled to the southern island for summer vacation.

His heart became empty.

His heart felt like emptiness.

I was born and raised in Kakamigahara City.

Three countries formed an alliance.

This mutetrahedron has a very unusual shape.

This is a model of a mutetrahedron.