Einstein's theory of relativity forms the basis of physics.

Her spontaneity brought vitality to the team.

This rubber is very elastic.

The stability of this bridge is very high.

It is important to understand the finiteness of this project.

This piece of art has perfect symmetry.

Even as he gets older, his virility does not diminish.

He determined that the bird was male from its distinctive feather color.

He has lived without going against the fate that was decided by his birth.

She is prone to worrying, so she is always thinking about something.