经过治疗后，他的健康状况有了轻微改善。

There was a ___slight improvement in his health after the treatment.

大雨给我们的火车旅程造成了一些轻微的延误。

The heavy rain caused ___slight delays to our train journey.

我一点都不知道该怎么解这个谜题。

I don't have the ___slightest idea how to solve this puzzle.