He succeeded in finding the fossil of a winged dragon.

This fossil is believed to be that of an ichthyosaur.

The winged dragon was flying around in the sky.

The velocity of flow of this river is 5 kilometers per hour.

The torrent of that river becomes particularly intense during the rainy season.

We went to Hokkaido to see the drift ice.

He is learning Kantei-ryū calligraphy.

Light particles play an important role in particle physics.

The tau particle is a type of lepton in particle physics.

The muon is a part of particle physics.