The reason that students can not understand the current concept is that prerequisite knowledge hasn't been grasped, and students also do not know the potential impact on the following course.

学生不能理解所学概念的原因是缺乏必备基础知识（先决知识），不理解所学这些知识对以后要学课程影响。

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Professional knowledge is of vital importance, however, good communication ability the prerequisite for others to find out your ability.

专业知识固然重要，但良好的沟通能力是让别人发现你能力的前提。

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Prerequisite software and knowledge.

软件要求以及知识要求。

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Regardless, "it's likely to be a very memorable ad, whether it is widely liked or not, and memorability is a prerequisite for an effective ad, " he says, drawing on knowledge of the company's past creative.

FORBES: Page 2 of 3

Paradoxically, knowledge of the local language, like Japanese or Mandarin, is not a prerequisite for effective communications for organizational development.

FORBES: Asia's Leadership Struggle

In a global economy where the most valuable skill you can sell is your knowledge, a good education is no longer just a pathway to opportunity it is a prerequisite.

NPR: Obama's Address To Congress