“年复一年”的英文表达是“year after year”或者“year by year”。这两个短语都常用于描述某种情况、事件或行为连续多年持续发生或存在。例如：
- Year after year, the company has increased its profits.（公司年复一年地增加了利润。）
- The popularity of online shopping has been growing year by year.（网上购物的受欢迎程度逐年增长。）
在具体使用时，可以根据语境和表达习惯选择合适的短语。
