红皮书

noun

red paper; a type of official document

The term '红皮书' is a variant based on the more common '白皮书' (white paper). It refers to an authoritative report or guide issued by a government, organization, or institution, typically with a red cover. While less common than '白皮书', it is used for specific types of publications, such as environmental reports (e.g., '中国环境红皮书') or certain statistical yearbooks.