Bob Etherington, a sales, negotiation and presentation trainer, says it can be the difference between success and failure.
销售、谈判和演讲培训人鲍勃•埃瑟林顿（Bob Etherington）表示，自信可以决定你成功与否。
Bob Etherington, a sales, negotiation and presentation trainer, says it can be the difference between success and failure.
销售、谈判和演讲培训人鲍勃•埃瑟林顿（Bob Etherington）表示，自信可以决定你成功与否。
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