教研室电化教学设备的维护与管理工作，是关系到教学工作能否正常开展的重要环节。

How to make good routine maintenance and management of audiovisual teaching equipment for our department is an important link, which concerns the normal operation of teaching.

以音像资料为载体的电化教学手段运用在《世界通史》课程教学改革中具有重要作用。

The application of electronic teaching means with audio-visual materials is very important in the teaching reform of the course of general Knowledge of the World History.

口语和书面语所蕴含的语境因素是静态的，而外语电化教学条件下的语境因素已被电教媒体所激活，因而呈现出视觉或听觉意义上的动态性。

Contextual factors in spoken or written expressions are static while those in media in Foreign Language Instruction are dynamic because they have been activated by electrical audio-visual media.