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多媒体使用没有针对性，偏离教学重难点；
Multimedia use no pertinence, deviated from the teaching difficult point;
youdao
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有针对性地使用多媒体，突破教学重难点；
A targeted use of multimedia, the breakthrough teaching difficult point;
youdao
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有针对性地使用多媒体，突破教学重难点；
A targeted use of multimedia, the breakthrough teaching difficult point;
youdao