day by day

day by day, day after day

• 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 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。

副词 day by day:

1. gradually and progressively
   同义词：daily

1. Repulse after repulse failed to deter Alec, who persisted day by day, at first with a marriage license and holy words.
   苔丝一次又一次的严辞拒绝未能制止亚历克，他整天缠住苔丝，先是用结婚证书和神圣的誓言来说服她。
2. Day by day she learnt more about her job.
   她日益了解自己的工作了。
3. The patient's condition is improving day by day.
   病人的病情逐日好转。
4. It is getting warmer day by day.
   天气一天天暖和起来。