four major basic key elements
four major basic key elements
四个主要的基本要素
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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According to the theory of the course analyses of communication, has analyzed and confirmed four major basic key elements of the influences agricultural extension effect.
根据传播学的过程分析理论，分析确定了影响农业推广效果的四大基本要素。
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