There are three file-structured databases, domain names are Papers, Subject Abstract, in this journal paper database of seismology.

地震期刊论文数据库分成二个数据库，题录数据库和论文文摘数据库。 它们是文件结构型数据库。

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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。

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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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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