People used the language to transmit the course content in the earliest teaching, Gradually, the teaching media has been developed from language to the textbook, projection, slide show, broadcast, sound recording, sound film, computer and so on.
最早的教学中采用语言来传递教学内容,然后逐步发展到通过教科书、投影、幻灯、广播、录音、有声电影、计算机等教学媒体来促进教学。
superficial view projection geometry course of basic mathematical thought
射影几何课程中的基本数学思想
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