旦翻译

英语翻译：

例句：

1. 一旦战争爆发，许多国家都要受到波及。
   If a war broke out, many other countries will be affected.
2. 元旦是一个亲属团聚的日子。
   New Year's Day is a day for family reunion.
3. 一旦你觉得发烧就吃这药片，每天3次。
   Once you feel feverish, take these pill three times a day.