Planned obsolescence or built-in obsolescence in industrial design and economics is a policy of planning or designing a product with an artificially limited useful life, so it will become obsolete, that is, unfashionable or no longer functional after a certain period of time. 

工业设计和经济学中所谓的“计划性淘汰”或“内置报废”指在设计产品时人为地设定使用寿命，这样产品在过了一段时间以后就会过时或者不好用。

The rationale behind the strategy is to generate long-term sales volume by reducing the time between repeat purchases.

这种策略背后的理念是通过缩短重复购买周期来促进长期销售额。