牛奶之王英语怎么说呢

"牛奶之王" (niúnǎi zhī wáng) in English can be translated as "Milk King." It is not a commonly used term in English, and I do not have information on its specific origins.
Here are some example sentences using "Milk King" in English:
"The Milk King brand is known for its high-quality dairy products."
"The Milk King cow is a popular mascot for the company's marketing campaigns."
"The Milk King factory is the largest producer of milk in the region."
In these sentences, "Milk King" is being used as a proper noun to refer to a specific brand or company.