He is a cat lover and plays with his cat every day.

Iceland is a country with beautiful nature as its charm.

Aishinka is my best friend.

My favorite song is Aegukka.

Aino Tani is my best friend.

Masato is my best friend.

A tautology refers to a logical formula that is always true, no matter what values are substituted.

The sphericity of this object is very high.

The Aisin Gioro was the imperial family of the Qing Dynasty.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.