He injured his semitendinosus muscle.

He injured his semimembranosus muscle.

The semispinalis thoracis muscle is a deep muscle in the back that supports movement from the neck to the waist.

The semispinalis cervicis muscle is a part of the neck muscles, helping to pull the head back.

This model of the cubohemioctahedron is very beautiful, isn't it?

This 立方半八面體 is one of the shapes in geometry.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

The great icosihemidodecahedron is a cube with a very complex shape.

This is a model of a great icosahemidodecahedron.