abstract
单词辨析：
强调抽象性。
Abstract ideas sometimes cannot match facts.
抽象概念有时会与事实不符。
It is difficult to read abstract theories.
抽象的理论很难读。
强调概念性的。
This conceptual theory comes from practical experience.
这一概念性理论源于实践经验。
Only human beings have the ability to think conceptual thoughts.
只有人类才有概念思维的能力。
强调基于理论而非实践经验的。
He studies theoretical physics.
他在读理论物理。
He believes only theoretical science can create miracles.
他认为唯有理论科学才能创造奇迹。
相关例句：
It is sometimes easier to illustrate an abstract concept by analogy with something concrete.
有时通过与某种具体事物的类比，更容易说明某个抽象的概念。
I like dogs in the abstract, but I can't bear this one.
一般说来，我喜欢狗，可是这只狗叫我受不了。
He read through the papers and made an abstract of their contents.
他把那些论文都读了一遍并做了内容摘要。
Abstract ideas may lead to concrete plans.
抽象的见解可能产生出具体的计划。
He is an abstract painter.
他是一个抽象派画家。
13. Essentially, a theory is an abstract, symbolic representation of what is conceived to be reality.
理论在本质上是对认识了的现实的一种抽象和符号化的表达。