Persistence is the most important skill a salesperson needs to cultivate, because all the other skills are based on persistence. If you have all the other skills listed below but you give up at the first hint of a “No,” you’ll never have a chance to use those skills. Furthermore, if you believe in yourself and in your product, your prospective customer will be inclined to believe what you say as well. 请判断下面的阐述是否正确：Persistence is the most fundamental quality for sales and all the other skills are based on it.