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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Prerequisite software and knowledge.

软件要求以及知识要求。

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A knowledge of web-authoring and geographic information systems is not a prerequisite this year, but is highly desirable.

网络编辑和地理资讯系统的知识虽很需要，但并非今年度的必修。

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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