day after day

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。

形容词 day after day:

1. occurring or done each day
   同义词：daily, day-to-day, day-after-day, every day

副词 day after day:

1. for an indefinite number of successive days
   同义词：day in day out

1. Day after day, the scientists worked hard in the laboratory.
   那些科学家们日复一日在实验室中努力工作着。
2. Day after day she wanders on until at length on the high, chalky table-lands.
   一天又一天，她漫无目标地流浪，最后来到一个白垩高地。
3. Day after day she waited in vain for him to telephone her.
   日复一日，她徒劳地等待他的电话。