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.

The International System of Units is a system of units commonly used worldwide.

We are friends who share both happiness and sadness.

Mr. Sekigami bought a necklace for his wife’s birthday.

He shot an arrow at the target.

This cloth is one shaku square.

He is an expert in analytical mechanics and deeply understands its theory.