求翻译：多媒体课件的制作与设计是至关重要的一环，其质量高低直接影响教学效果。在设计和制作多媒体课件时，教师要遵循基于课本、内容科学、文字精炼、主次分明、重点突出、图文并茂、实用高效等原则。恰当运用各种表现媒体是什么意思？

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多媒体课件的制作与设计是至关重要的一环，其质量高低直接影响教学效果。When designs and manufactures the multimedia coursewares, the teacher wants to follow based on the textbook, the content science, the writing fining, primary and secondary distinct, key prominent, abundant and elegant, practical highly effective and so on the princi

Design of multimedia courseware and is essential for a ring, its quality directly affects teaching. In the design and production of multi-media courseware, teachers should follow the textbooks, science-based, refined and prioritized, focused text illustrations, practical and effective principles. Ap

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