Day by day the situation is improving.

情在天天地好转。

It is getting warmer day by day.

天气天比天暖和了。

Activists are increasing in number day by day.

积极分子的人数日益增加。

Day by day the disappointed lover peaked and pined.

这失恋的人天天地憔悴下去。

Day by day she grew more confident about the job.

她对工作天比天更有把握。

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.

摘要随着全世内水体富营养化的加剧，蓝藻“水华”及其毒素危害日益加剧。