用英语礼貌的说再见怎么说

To say goodbye politely in English, you can say "Goodbye" or "Goodbye, it was nice to meet you" or "Goodbye, have a good day." Other options include "Farewell" or "Take care." You can also use more casual phrases like "See you later" or "See ya." It's important to choose a phrase that is appropriate for the context and the relationship you have with the person you are saying goodbye to.