Diamond is the hardest mineral on Earth.

This mountain is mainly composed of granodiorite.

Cerebrospinal fluid plays an important role in protecting the brain and spinal cord.

We should always remember the power of Kannon in difficult times.

I do laundry using synthetic detergent.

The Democratic People's Republic of Korea is a country located in East Asia.

This speech synthesizer generates very high-quality voices.

He was deeply thinking about '稽'.

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.