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

This is a 六角四片四角孔ねじれ正多面體, in other words, a muoctahedron.

This is a model of a muoctahedron.

The police detained him to investigate the incident.

Kanna has two dogs.

The coffee overflowed from the cup.

We use a supercomputer to perform complex calculations.

There were many people gathering, and the park was bustling.

My great-grandmother lived until she was 100 years old.

Mr. Zhai is my best friend.