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，逐渐让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融入听众中，让自己的演讲及课堂更加充满生机活力。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 emergence and spread gradually to the students and educators from the Chalk dust, limb pain Many of the hassles. Today, multi-media system has been applied to the sale of goods, items an

In the past several dozens years, China's teaching continuously was in the blackboard to add the chalk pattern, but along with the multimedia system appearance and the popularization, let the general students and the educator gradually got rid of many worries which the chalk ash, the body were sore.

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