This paper introduces the structure and work process of digital camera, and puts forward the principles of choosing and buying it, and discusses the trend of its research and development.

介绍了数码相机结构及其工作原理，提出了数码相机的选购原则，并探讨了数码相机的研究和发展趋势。

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The rational distribution of retail drug shops and making buying drugs convenient for people are basic principles to setting up retail drugs shops.

合理布局和方便群众购药，是设置药品零售网点的原则。

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And these principles, value investing, for instance, buying cheap, buying good, works in all these countries, according to their research.

FORBES: Intelligent Investing Transcript