详细解释:日复一日
词意辨析：
day by day, day after day这是形似的与时间有关的固定词组。
day by day: 意为“一天一天地”，“逐日”，表示事情的逐渐变化过程。该短语只能作状语。it's getting colder day by day.
天气一天天冷了起来。the boy is getting better day by day.
那孩子一天天好了起来。
day after day: 意为“日复一日”、“一天又一天”，表示一个重复（周而复始或循环重复）的动作或事件。该短语可作主语和状语。day after day went by, and still no message arrived.
日子一天天过去，仍然杳无音讯。i have to do the work day after day.
我得天天做这项工作。英语解释：
形容词 day after day:
occurring or done each day同义词：daily, day-to-day, day-after-day, every day