Explanation of meaning: Naphthalene nài (name) is an organic compound; A volatile crystal with a special smell. Usually used to make dyes, resins, drugs, etc. Commonly used health balls, commonly known as "mothballs", are made of it.
Related information:
Mothballs are divided into natural mothballs and synthetic mothballs. Natural mothballs are smooth, colorless or white crystals with fragrant smell, which will float in water. Natural mothballs, also known as smelly beads, are used to prevent insects, moths and mildew. They were originally aromatic organic compounds extracted from camphor tree branches and leaves.
Synthetic mothballs are organic compounds. Most camphor balls containing naphthalene are white, irritating and unpleasant, and immersed in water.