"日积月累"在英语中被称为"accumulate over time"或"build up gradually".
这个短语来源于中文，指的是通过长时间的不断积累，才能达到目标或获得成功。
一些例句：
Success comes from the accumulation of small efforts over time. (成功来自于时间的积累)
He had accumulated a large sum of money over the years through wise investments. (他多年来通过明智的投资积累了大量的钱)
It takes time and patience to accumulate the knowledge and skills necessary to excel in your field. (需要时间和耐心来积累在你的领域中出类拔萃所必需的知识和技能)