元旦快乐用英文说'Happy New Year'。下面是一篇关于元旦快乐的英文文章：

Happy New Year! As the first day of the year, New Year's Day is a time to start fresh, set new goals, and reflect on the past year. It is also a time to gather with loved ones and celebrate the beginning of a new year.

Whether you celebrate with fireworks, a festive meal, or simply by spending time with family and friends, the important thing is to take a moment to appreciate all that the past year has brought and to look forward to the possibilities of the new year.

As we say goodbye to the old year and welcome in the new, let us remember to be grateful for the blessings in our lives and to strive to make the coming year even better. Here's to a happy and prosperous New Year!