The health of the nationals is the wealth of the country.

He absorbs new information like a sponge soaking up water.

Democracy is a political system that runs the country according to the will of the people.

There are various ethnic groups in the world.

He is very interested in science.

I think it's important to get enough sleep.

In order to keep the secret, he said, 'One word too many will be the end of me,' and didn't say anything.

The water vole is a small mammal native to Europe.

The European water vole is a small mammal native to Europe.

Due to his somnambulism, he may walk around unconsciously in the middle of the night.