There is a complex love triangle between them.

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

Please calculate the area of this right-angled triangle.

He is known as an expert in subcritical nuclear experiments.

The number of nuclear-armed countries is increasing worldwide.

He always makes accurate judgments.

Countries around the world are caught up in an arms race.

The cytoskeleton plays a crucial role in maintaining the shape of the cell.

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

He claims to have seen an unidentified flying object.