He played a perfect fifth scale on the piano.

Double dipping is a breach of etiquette.

I overslept today, so I was late.

The sphericity of this object is very high.

This fabric has high color fastness, so it is hard for the color to fade even when washed.

When it reaches absolute zero, the molecular motion of matter stops.

The image on my new high-definition TV is very clear.

The image on my new high-definition television is very clear.

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.

UNESCO is an international organization that promotes the development of education, science, and culture around the world.