His loud vocalization echoed throughout the room.

He sometimes has pain in his crotch when he rides a bicycle.

His father was very stubborn, so the proverb 'Like father, like son' fits perfectly.

That cute little girl is my granddaughter.

Arithmetic operators are symbols used for mathematical calculations.

My mother always said, 'A well-slept child is a well-kept child,' and encouraged me to go to bed early.

Mieko is my best friend.

A unary operator operates on one operand.

This disease is caused by the gene.

In this math problem, it is important to correctly understand the operand.