obsolescence allowance

例句：

1. 1.The old model is no longer suitable for modern production needs.
   旧型号不再适合现代生产需求。
2. 2. The obsolescence of the old technology has been a major concern for many companies.
   旧技术的淘汰已成为许多公司的主要担忧。
3. 3. As technology advances, obsolescence becomes an inevitable reality for many products.
   随着技术的发展，许多产品的淘汰成为不可避免的现实。