Literature Reference: In the Shang Mountains, there are Huang Qi; in Yingchuan, there are Chao Xu. Source from 'Reading History Five Poems 2' by Bai Juyi.
巢: Nest, the lair. Exercise caution in its use.
许: "Consent and approval. A character that signifies the ease of achieving great endeavors and is auspicious for future matrimony."
Meaning: Chao Xu refers to the ancient hermits Chao Fu and Xu You, symbolizing a noble and reclusive spirit, detached from worldly affairs.