The concreteness and abstraction of drawing arts, both of which connect and vary, make up the basic form of drawing works and the tow supporting points for drawing types.

绘画艺术的具象性和抽象性相互区别又相互联系，共同构成绘画作品的基本形态，是绘画样式的两个支撑点。

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Marx and Engels studied realism for over 40 years, which were divided into four stages:in the first stage, importance was attached to the concreteness of history;

马克思、恩格斯对现实主义的研究经历四十余年三阶段：第一阶段是反对抽象的善恶观念，强调历史具体性；

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