My new four-wheeled vehicle is very fast.

My new four-wheeled vehicle is very fast.

He goes to the gym every day to train his quadriceps.

He made a model of a regular tetrahedron.

Nigorobuna is one of the traditional dishes in Japan.

The era of the Three Sovereigns and Five Emperors is an important period in Chinese history.

We celebrate our wedding anniversary on the twenty-fifth day of the month.

The new project will start in seventy-five days.

The 正五胞體 is a simple convex polytope in four dimensions, having five vertices.

A 5-cell is a simple convex polytope in four dimensions.