What does blue mean?

Explanation: 1 Clothes worn by ancient students. 2. Borrow students and scholars. 3. In the Tang Dynasty, the civil servants of Bapin and Jiupin all wore green clothes. 4. generally refers to humble official positions. 5. refers to the clothing color of the humble. 6. refers to the gods. 7. "Biography of Liang Shu and Hou Jing": "After usurping the throne, I wore a white gauze hat and still wore a blue robe." Later, Hou Jing was called "Blue". 8. Metonymy refers to Zheng Dan in Peking Opera.

Example: Red tears are crying on the sleeve, which is wetter than Sima Qing's shirt. Shrike flew east to Yan Xi and asked about the return date before boarding the plane. Master Wang