I learned Pythagoras' theorem at school.

Pentathlon is a competition that tests both physical strength and technique.

He participated in the Olympics as a pentathlon athlete.

The seasoned egg in this ramen is delicious, isn't it?

We swear to be friends forever.

A new play structure has been installed in the park.

A new play structure has been installed in the park.

Twin primes are a special existence in mathematics.

My favorite breakfast is soft-boiled eggs and toast.

Gonbee is my best friend.