A soliton is a part of physics, referring to a wave that progresses while maintaining a certain shape.

The Gulf of Tonkin is located in the northern part of Vietnam.

He is good at speaking Spanish.

He likes to learn new words.

He can speak Japanese fluently.

He has a very warm heart.

He understands the meaning of the proverb 'Teaching is half learning', which means that teaching leads to one's own learning.

He always keeps in mind the phrase 'If one learns without thinking, it is a waste.'

There are various ideophones in Japanese.

'Beautiful' and 'pretty' are synonyms.