Kunminjōon is a book for teaching the correct pronunciation of Hangul.

He is doing a special exercise to strengthen his omohyoid muscle.

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

Understanding the concept of 'Ha-line conversion sounds' is important in learning Japanese.

He is an expert in international law.

He started singing The Internationale.

He is interested in learning the international language.