He was the first discoverer of that new species of plant.

The Tokyo metropolitan region is the center of Japan's economy.

My mother prepares a traditional Japanese meal every day.

Among polyandrous animals, there are species where one female mates with multiple males.

He is recognized as the top person in that field.

He is exactly in the state of 'A frog in a well does not know the vast ocean.'

He was swimming freely as if he was a fish playing in the pot.

Three days ago, I went to Tokyo.

He underwent surgery on the depressor septi nasi.

World War I was a large-scale war that lasted from 1914 to 1918.