It's difficult to calculate the area of this hexagon.

He is known as an expert in subcritical nuclear experiments.

The Cultural Revolution is a part of China's history.

He claims to have seen an unidentified flying object.

Let's calculate the area of this right-angled triangle.

He has a deep interest in avant-garde art.

Tan like libraries.

He put the tea on the small table.

This software has forward compatibility.

I started learning new things to broaden my horizons.