He is recognized as the top person in that field.

Three days ago, I went to Tokyo.

Him calling me lazy is truly a case of the pot calling the kettle black.

He chose a stable job, saying 'a bird in the hand is worth two in the bush.'

The 正十六胞體 is one of the regular polytopes in four dimensions.

The 16-cell is one of the convex regular polytopes in four dimensions.

This regular dodecahedron is a geometric shape with perfect symmetry.

This solid is called a regular icosahedron, and it is made up of 20 equilateral triangles.

World War I was a large-scale war that lasted from 1914 to 1918.

He was anxious about starting a new business, but I encouraged him by saying, 'Even a journey of a thousand miles begins with a single step.'