公共英语PETS4写作精选短语35

会计考友

product life cycle
　　 the marketing concept of a product having a natural period ranging from its introduction and rise in sales to its sales decline and expiration when customers purchase newer alternative products
　　 Example:
- K; S, O7 z- X; G) \4 _　　 Because the computer game industry changes so rapidly, the product life cycle of a popular computer game may be only 18 months or less.