We conducted a spectral analysis to investigate the spectral characteristics of this substance.

He attended the party wearing a mask.

A surprised expression was on his face.

A surprised expression was on his face.

He looks very young-looking.

The scutes of this crocodile are very hard, playing a defensive role.

This is my first question.

He made a model of a dodecahedron.

This regular tetrahedron is composed of equilateral triangles on all sides.

His body is very healthy.