In particular, electromagnetism is a very abstract subject.

尤其是，电磁学是很抽象的学科。

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PUBLIC finance can seem a dry, abstract subject until the point when it becomes all too real.

公共财政似乎是一个乏味抽象的话题，直到当它实实在在地摆在眼前。

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Subject concepts are a special kind of concept: ones that are concrete, subject-related and non-abstract.

主体概念是一类特殊的概念：它们是具体的、与主体相关的、非抽象的。

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In particular, electromagnetism is a very abstract subject.

尤其是，电磁学是很抽象的学科。

麻省理工公开课 - 媒体、教育、市场课程节选

What caught my eye this month is "The Sisters" (below), a hypnotically luminous 1991-93 abstract work by Brice Marden, one of America's leading artists and the subject of a new book, "Brice Marden: Phaidon Focus" (Phaidon).

WSJ: A Flower Arrangement Inspired by Art