This mineral is called ulexite and has special optical properties.

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

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

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

Watching that movie, it was really moving.

His hearty handshake represents his personality.

Tokushi is my best friend.

The atmospheric pressure in this area is very low.

What is the pressure of this tire?

This pressure is too high, I have a headache.