He picked up the whip and started practicing.

Functional analysis is a branch of mathematics that studies the properties of functions in infinite-dimensional spaces.

I studied linear algebra at university.

The Great Eastern Japan Earthquake is one of the most damaging earthquakes in Japanese history.

He found out that she was with child.

This is my new car.

This temple is an ancient ruin.

He worked all night to finish the job he had begged for.

My parents are very kind.

What does the axis of this diagram represent?