过期的纯牛奶怎么说英语

Expired milk is milk that has passed its expiration date and is no longer considered fresh or safe to consume. In English, you can describe expired milk as "spoiled milk" or "sour milk." It is important to check the expiration date on milk and other dairy products before consuming them to ensure that they are still fresh and safe to eat. If you come across milk that has expired, it is best to discard it and purchase a fresh carton.