Hello, my name is Ada Wen. I am a graduate from South China Normal University. I want to apply for this post because it seems tailored to my competencies, which include sales and marketing. I used to have a three-month internship in ABC Company as a sales assistant, where I helped to make phone calls to promote our products and check the sales figures with my teammates, which had resulted in a 10% increase in sales and our boss was satisfied with our active and careful work. And I am confident to be qualified for the advertisement seller. Thank you.