我们所借以开始的是存在，抽象的存在，而现在我们达到了作为存在的理念。但是这种存在着的理念就是自然。

We began with Being, abstract Being: where we now are we also have the Idea as Being: but this Idea which has Being is Nature.

youdao

好消息是：说到底，大谎言只是一缕想法、一个概念、一种信念，只有抽象的存在而且自身并没有力量，谎言的力量都是人类给的。

Here's the good news: in the end, the Big lie is just a thought, a concept, a belief, and abstraction and has no power except the power you have loaned to it.

youdao

作者建造的抽象系统仅仅存在于他的脑海里，它的物理表现(书)仅仅是为了方便的保存和发行的一种手段。

The abstract system that an author constructs exists only in his mind, and the physical manifestation — the book — is only a convenient means of storage and distribution.

youdao

The state was an abstraction, but in the person of the czar it was a reality.

国家" 只是个抽象概念,但沙皇这个人是真实存在的

耶鲁公开课 - 欧洲文明课程节选

Or you could use the "is there" question to ask about the existence of something more abstract

另外，你也可以使用“Is there”问句来询问更为一些抽象的事情是否存在。

Is there 课堂 - SpeakingMax英语口语达人

So the number two, the numbers, three, whatever it is, whatever they are, are these Platonic abstract entities that don't exist in space and time.

因而,数字2,数字3,不管它们是什么,至少它们都是不存在于时空中的,柏拉图式的抽象实体

耶鲁公开课 - 死亡课程节选