Mammals can maintain a constant body temperature.

I think it's accurate to say that.

He is the true monarch of that country.

He owns a big house.

Looking at the ocean, my heart expanded.

Taikai is my best friend.

We learned about the protection of the main sea.

The beluga whale lives in the Arctic Ocean.

In the old days, people thought of whales as mysterious beings.

A whale is a large marine mammal that can also be called the king of the sea.