He is undergoing electrotherapy for his back pain.

It's difficult to understand the principles of electrooptics.

Fundamental interaction is one of the most important forces in physics.

My father is an ichthyologist and has a deep knowledge about marine life.

The chances of him winning are a hundred to one.

He is the person who perfectly embodies the proverb 'ill weeds grow apace'.

He is the type of person who understands ten from hearing one.

He is an excellent keeper, good at guarding the goal.

What is the capacity of this capacitor?

The Paleolithic is the first era of human history.