鉴于大家对英语英语考证PETS写作十分关注，我们编辑小组在此为大家搜集整理了“关于13年PETS4写作精选短语之参考”一文，供大家参考！
关于13年PETS4写作精选短语之参考
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:
Because the computer game industry changes so rapidly, the product life cycle of a popular computer game may be only 18 months or less.