Furthermore, this paper put forward the added value gap in the design of product accessory, which crystallizes the train of thought and charts a direction for product accessory design.

此外，通过对附加值理论的深入分析，本文提出了附属产品设计中的附加价值缺口，明确了附属产品设计的思路与方向。

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Thus analysing the product accessory from the angle of system theory and system design is a keystone of this paper.

因而从系统论和系统设计的角度分析附属产品设计是本文的一个重点。

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