The present research on sells about the direct selling and the multi-level marketing is very rare, and is lack of the real diagnosis research and the typical case.
已有的关于直销和传销的研究以社会学为视角的很少见，且缺少实证研究和典型案例。
The present research on sells about the direct selling and the multi-level marketing is very rare, and is lack of the real diagnosis research and the typical case.
已有的关于直销和传销的研究以社会学为视角的很少见，且缺少实证研究和典型案例。
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