The answers to this question are both yes and no!yes,because in the minds of people doing the selling,there is ;and no,because the principles are the same for both types of selling.

对这个问题的答复是两个和没有!是，因为在做销售的人的头脑里，有;并且没有，因为原则是同样为卖的两个类型。

用网站翻译软件翻译之后经过修饰再发帖吧,天外飞仙...

我修饰过了谢谢