I went to see the Arc de Triomphe in Paris.

He is deeply studying about the classification of superphylum in his biological research.

A baby's fontanelle naturally closes a few months after birth.

A baby's fontanelle closes a few months after birth.

This book explains in detail how to use the 'Kyūjitai form of 声門' in old Japanese.

His incisors are very sharp.

There is a large sluice gate in this river.

He used a metal detector to search for treasure on the beach.

A barred spiral galaxy can be said to be a work of art in the universe because of its beautiful shape.

I can't find my Allen key.