知识信息传播；服务功能；宁夏固原。
Knowledge information dissemination; Service function; Ningxia Guyuan.
课堂教学作为一种特定的知识信息传播形式，必然要受到传播媒体的制约。
As a special form of knowledge propagation, teaching in class is bound to be restricted by medium.
因为人们可以在互联网上获得信息，知识传播得很快。
Because people can find information on the Internet, knowledge spreads quickly.
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