We booked a double room.

He is learning Ancient Greek language.

He acknowledged his mistake and self-reflected by placing his hand on his chest.

I like the unique texture of flying fish roe sushi.

I am studying the philosophy of Guanzi.

There is a newly born calf on my farm.

The study of nucleons is an important field in science.

This math problem needs to be solved using the correct operator.

Mamiko is my best friend.

What is the extension of this file?