She's always a goody two shoes, and is well-liked by her teachers.

Yuriko is my best friend.

He is exactly in the state of 'A frog in a well does not know the vast ocean.'

He spoke of his big dreams, saying, 'How can a sparrow understand the ambitions of a swan?'

My boat is equipped with the latest fishfinder.

He found a way to profit from a difficult situation like fishing at the bottom of a river.

He was swimming freely as if he was a fish playing in the pot.

He is a person who follows his own path, and the phrase 'a big fish does not swim into a small stream' fits him perfectly.

A binary operator is one of the basic concepts in algebra.

Before starting a new business, he said, 'Nothing ventured, nothing gained.'