Yuriko is my best friend.

We are aiming to kill two birds with one stone with this plan.

His words held a double surprise, like 'isseki-rokuto'.

This mineral is called ulexite and has special optical properties.

This stone is a mineral called clinozoisite.

This beautiful stone is a mineral called clinozoisite.

He succeeded in a difficult project with the spirit of 'ishi no ue ni mo sannen', which means great works are performed by perseverance.

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

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

The Uniform Resource Locator indicates the address of a web page.