当你有自信时，你相信自己及对你的产品有信心，这样自信的情绪就会产生感染的力量，人们会从你身上感觉那股销售的自信。
When you are confident, believe in yourself, and you're comfortable with your product, that emotion of confidence becomes contagious. People feel that confidence you have in what you sell.
但是，如果有人递给你一件非常酷的产品并要去你代言，你对这产品有足够的信心吗？
Yet… what if someone handed you a cool new product and wanted you to endorse it… would you have enough faith to do it?
情感介入 这种困惑的核心要素就是对你自己以及你的产品有信心。
Emotional involvement. The cure for this subjective ailment is to believe in yourself and in your product.
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