本文以企业的知识管理活动为主要研究对象，以管理本质的二重性作为分析展开的框架。

I select knowledge management of enterprises as main object to analyze and approach this issue from two aspects of the nature of management.

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一项以白种人为主要对象的新研究表明，多吃农产品可以让白种人的皮肤黄中透红，从而增加了外貌的吸引力。

A new study, done with primarily Caucasian subjects, finds that eating produce heightens red and yellow skin tones, which increases attractiveness.

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本文以有源磁轴承的数字控制系统为主要研究对象。

The main aim of this thesis is to study and implement the digital control system for magnetic bearing.

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