求翻译：而我认为一个优秀的推销员要把东西卖给顾客，第一，推销员要肯定自己相信自己能够成功。第二，推销员要十分了解他要推销的商品，把它最好的一面呈现给顾客。第三，推销员要有坚持不懈的精神，还要学会用适当的语言引起顾客对商品的兴趣即使他不需要这个东西。是什么意思？

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But I thought an outstanding salesman must sell to the thing the customer, first, the salesman must affirm oneself believed oneself can succeed.Second, the salesman%

And I think a good salesman to sell to customers, first, the salesman sure to trust yourself to succeed. Second, the salesman to really understand, he wants to sell goods, best rendering it to the customer. Third, the salesman to have persistent spirit, but also to learn to use appropriate language