是非之间没有明确的界限。

There is no clear dividing line between what is good and what is bad.

《牛津词典》

这事还没有明确解决。

It has not yet definitely settled.

《新英汉大辞典》

目前还没有明确的答案，但有两种截然不同的思想流派。

There are no clear answers yet, but two distinct schools of thought.

youdao

So, there's no absolutes about this, this is a general response where all the features can be different with different pathogens.

这其中并没有明确的规律,免疫应答是普遍存在的,但针对不同的病原体的应答规律各不相同

耶鲁公开课 - 生物医学工程探索课程节选

A different way of putting it-- and none of this is going to come in with a sharp, decisive theory.

从另一个角度来看-,注意，我现在讲的内容,目前都没有一个明确的理论。

耶鲁公开课 - 心理学导论课程节选

If the question of time is not explicitly brought up, then you should know that you have to use this formula.

如果时间的问题并没有明确提出,那你应该知道,必须要用这个式子

耶鲁公开课 - 基础物理课程节选