He is still in his tsun phase, so he doesn't talk much.

She is in her dere phase now.

He is experiencing the difficulties of puberty.

According to Freud's theory, the phallic stage is a part of a child's sexual development.

Infancy is an important period for human growth and development.

I am a new student of this school.

He said, 'Each person has one life, like a pike or a shrimp,' and decided to live his life with care.

He vowed to live through this world and the next with the spirit of once-in-a-lifetime encounter.

Old English is a language that was spoken in England from the 5th to the 12th century.

Let's cherish every encounter with the spirit of 'once in a lifetime'.