He is deeply researching that theory.

He is good at logical thinking.

I am planning to go to Russia next week.

Europium is one of the rare earth elements.

Estrogen is a type of female hormone.

He was elected as a member of the senate.

Androgen is a type of male hormone.

She loves Genroku designs, especially often wears kimonos with Genroku sleeves.

Freedom of expression is one of the fundamental rights of democracy.

He is known as a freedom fighter.