名牌辅助产品，系列新产品一种延伸产品，如某种软饮料的保健型或某种洗涤剂的液体型，这种产品附加到一系列产品中以促进主要产品销售

An extension product, such as a diet version of a soft drink or a liquid version of a detergent, added to a line to support the sales of the main product.