The factors of soil formation affecting soil background contents of elements in Beijing area are mainly discussed in this paper.

本文讨论了影响北京土壤元素背景值的成土因素，主要有成土母质、生物气候、地貌、时间和人为因素。

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The main component analysis has been used to study the principal factors which affect soil background contents of a number of metals in Beijing area.

用主成份分析研究了影响北京地区土壤元素背景值的主要因素。

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The results showed that the principal factors affecting the metal background contents were landforms for plain area and soil parent material for mountain area.

分析结果表明，影响土壤元素背景值的主要因素，在平原地区是地貌条件，在山区是成土母质。

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Plenty of measures can tell you something about the user's state of mind: keystrokes, how many windows are open and their content, whether the user is scrolling, the time of day, the contents of a desktop calendar even background noises from a microphone and visual information from a camera.

ECONOMIST: Computing