This particle is very small.

He is known as a person with learning.

He received the letter challenging him to a duel and began preparing for the duel.

This math problem requires an understanding of functions.

I was really admirable of his efforts.

I really admired his effort.

What does this function represent?

He was known as a treacherous vassal.

This system enables real-time operation.

I am enjoying appreciating paintings at the art museum.