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。是什么意思？

In the past decades, the teaching of Chinese has been in blackboard chalk Mode, but with the emergence and popularization of multimedia systems, and gradually let the majority of students and educators to get rid of the chalk a lot of trouble, limb pain. Today, multimedia systems have been applied t

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.

The past few decades, has been in a Blackboard with chalks mode of teaching in China, but with the emergence of multimedia systems and spread gradually so that the majority of students and educators to emerge from many troubles the chalk dust, physical ache. Now, multimedia systems have been applied

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