What are the four-character idioms that begin with the word "yellow"?

Yellow dust and clear water: metaphor changes rapidly.

Auspicious day: An auspicious day when superstitious people think they can do things.

Huang Er biography: Huang Er: dog name; Books: letters. The yellow dog sends books back and forth to the host. Metaphor after sending letters from home.

Yellow hair: yellow hair: the hair of the elderly turns from white to yellow; Crying: In ancient times, the hair of a single boy without a crown drooped. It refers to old people and children.

Yellow hair and yellow teeth: a metaphor for longevity.

Huang Hu? ng]？ Basic explanation:

1, like gold or sunflower flower color: yellow. Dusk. Niuhuang Huang Chengcheng. Loose lips and orpiment.

2. Especially the Yellow River in China: Yellow Disaster. Treat yellow. Yellow flood plain.

3. what do you mean? Huangdi? (That is? Xuanyuan? The legendary leader of the tribal alliance in primitive society): Huang Lao (Yellow Emperor and Laozi). Descendants of China.

4. Things fail or the plan cannot be realized: things are yellow.

5. Last name. Such as Huang Xiaoer.

6. Yellow also refers to pornography and unhealthy. Such as pornographic books and periodicals, pornographic photos, etc.