This mineral is called ulexite and has special optical properties.

He always boasts, but in reality, he does nothing.

He has a habit of always boasting.

Topology is a branch of mathematics that abstracts and generalizes the concept of space.

Japan's gross national product is the third highest in the world.

He was moved by the view from the top of the skyscraper.

This area has undergone such a great change that it can be described as 'the sea has turned into a mulberry field'.

His life changed just like 'fields and mountains turn into seas and oceans'.

He always lives a life appropriate to his lot.

He is living a life appropriate to his status.