At the heart of these open source practices are two essential prerequisites: cooperation and trust.

在这些开源实践的中心是两个基本的假设：合作和信任。

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One of the essential prerequisites of software engineering is to start with a good requirements specification.

软件工程的一项重要前提就是要有很好的需求说明书。

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"Honesty" is our essential prerequisites of education and it now enjoys the high reputation in the society.

我们以“诚信”为办教育的前提，在社会上享有很高的声誉。

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