The article elucidates knowledge economy from three cardinal points-the conception of the knowledge economy, the connotation of knowledge economy and the character of the knowledge economy.
本文从知识经济概念的提出、知识经济内涵以及知识经济特征三个方面阐述了知识经济。
The locations of cardinal points of coaxial spherical system is defined by the conception of three pairs of cardinal points of coaxial spherical system in the air co-medium.
从共轴球面系三对基点的概念出发，给出了前后介质都是空气的薄透镜组和厚透镜的基点位置的简易解法。
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