He is good at playing the flageolet.

He was playing an ancient flute.

Yō is always shining brightly around him.

Studying the ten Heavenly Stems helps to understand the traditional Chinese calendar system.

We need a detailed report to understand the real situation of this project.

He is good at playing the canon.

This three-dimensional art is very unique.

Please refer to the diagram below.

These two angles are in a supplementary relationship.

He is good at playing percussion instruments.