Transition metals play an important role in chemical reactions.

This metal is very hard.

An up quark is one of the fundamental particles in particle physics.

The National Aeronautics and Space Administration announced a new space exploration plan.

It's difficult to understand the movement of the great stag in shogi.

He performed acrobatics in midair.

He is an actual person.

He sprained his ankle.

The Arctic Ocean is a cold and beautiful sea.

I submitted the documents to register for the new class.