求翻译：过去几十年，中国的教学一直处于黑板加粉笔模式，但随着多媒体系统的出现及普及，广大学生和教育工作者摆脱了粉笔灰、肢体酸痛的诸多烦恼。如今，多媒体系统已经应用到商品销售、项目及产品推介、企业宣传和培训以及多媒体教学等各个领域中，成为社会生活必不可少的一部分。而随着技术的极速发展，人们对多媒体系统的要求也日益增高，急需寻求一种新技术以替代陈旧的键盘加鼠标操作模式，不必总与电脑寸步不离。通过远距遥控使自己能够脱离电脑，靠近听众，让自己的演讲及课堂更加充满互动，充满活力。是什么意思？

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In previous 10 years, the Chinese teaching has been at the blackboard with chalk, but multi-media system and the universal, the students and educators from the Chalk dust, physical pain Many of the hassles. Today, multi-media system has been applied to the sale of goods, items and products, business

The past few decades, has been in a Blackboard with chalks mode of teaching in China, but with the emergence of multimedia systems and universal, vast numbers of students and educators to emerge from many troubles the chalk dust, physical ache. Now, multimedia systems have been applied to the sale o