day by day, day after day

• it's getting colder day by day.
  天氣一天天冷了起來。
• the boy is getting better day by day.
  那孩子一天天好了起來。

• day after day went by, and still no message arrived.
  日子一天天過去，仍然杳無音訊。
• i have to do the work day after day.
  我得天天做這項工作。

副詞 day by day:

1. gradually and progressively
   同義詞：daily

1. Repulse after repulse failed to deter Alec, who persisted day by day, at first with a marriage license and holy words.
   苔絲一次又一次的嚴辭拒絕未能制止亞歷克，他整天纏住苔絲，先是用結婚證書和神圣的誓言來說服她。
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.
   病人的病情逐日好轉。
4. It is getting warmer day by day.
   天氣一天天暖和起來。