We have been working on this project for ten months.

The 24-cell is one of the geometric shapes in four dimensions.

The 120-cell is one of the regular polytopes in four dimensions.

The 正百二十胞體 is one of the regular polytopes in four dimensions.

The 正二十四胞體 is one of the regular polytopes in four dimensions.

He lived in Japan for a year and a half.

I achieved a big success.

The surface of this table is very smooth.

In mahjong, the player across put a reach.

He is studying the shape of a tetrahemihexahedron.