Day by day the situation is improving.

情况在好转。

It is getting warmer day by day.

气比暖和了。

Activists are increasing in number day by day.

积极分子人数日益增加。

Day by day the disappointed lover peaked and pined.

这人悴下去。

Day by day she grew more confident about the job.

她对工作比更有把握。

Day by day the structure heightened.

建筑物逐日增高。

With the aggravation of water eutrophication in the world, cyanophycean bloom and its toxin harm aggravated day by day.

摘要随着全世界范围内水体富营养化加剧，蓝藻“水华”及其毒素危害日益加剧。