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ts dynamically, but human teachers can not do this on blackboards.multimedia makes our study more lively and interesting. for example, a cdrom disk named “encarta encyclopedia” contains 650 mbinformation including images, graphics, music clips, video clips,animations , texts, hotwords, and database search functions. fields involved includes physical sciences, performance arts, socialsciences, politics, military, education and so on. when pressing a button, i can hear american president clinton39。s speech clip. i may enjoy playing all kinds of musical instruments in the world. i can also see the animation of many physical phenomena. this makesphysical concept to be understood deeply (3). the audio features of multimedia can greatly help me learning (4) foreign languages. with its speech output capabilities, i39。m no