Alkenes play an important role in organic chemistry.

Alkanes are basic components of organic chemistry.

Neuroanatomy is an important field of study for understanding the structure and function of the brain.

Demography is an important tool for understanding various aspects of society.

I studied linear algebra at university.

The stylohyoid muscle is part of the muscles of the head and has the role of lifting the hyoid bone.

Special judicial police officers are working hard every day to protect the law in Japan.

Please let me hear your opinion, sir.

He was deeply thinking about '稽'.

The United Nations Environment Programme is providing solutions to global environmental problems.