升级销售可以理解为追加销售，即向客户销售销售某一特定产品或服务的升级品、附加品或者其他用以加强其原有功能、用途的产品或服务。这里的特定产品或者服务必须具有可延展性，追加的销售目标与原产品或者服务相关甚至相同，有补充或者加强、升级的作用。
升级销售：向宾客出售酒店内价格更高、更高等级的房间。
Up-Sell: Moving a guest into a higher priced room in the hotel with a rate increase.
每隔几年就有一批新的主机发售用以满足玩家的升级要求，从而激起一股销售的浪潮。
Every few years a new crop of consoles is launched, spurring a wave of sales as gamers upgrade.
他的看法是程序升级其实比初始销售“钱力”更大，可惜大多数商店都还不支持为升级付费的模式。
He sees application upgrades as a much better way to make money than the initial sale, yet most app stores do not support paid for upgrades.
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