Alkenes play a very important role in organic chemistry.

He picked up the whip and started practicing.

Functional analysis is a branch of mathematics that studies the properties of functions in infinite-dimensional spaces.

I studied linear algebra at university.

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.

Mr. Koza puts pepper on everything.

Takako is my best friend.

In this map, the terrain of Hensuu is detailedly depicted.

I think his talent is exceptional.

The Kingdom of Sweden is located in Northern Europe.