1.找一个/一类熟悉的产品，刻意去分析有关产品生命周期的产品开发，用户使用情况，价格，销量，外部市场变化等，通过改变横纵坐标参数，画出多种图形。

产品：水杯，水杯在夏季和冬季销量最大。

图片发自简书App

2.阅读一篇以上Product Life Cycle相关英文文章，要求用英文摘录文章主旨，并列出关键单词等，还须附上文章链接

主旨：Your Small Business Guide to Product Life Cycle Management

A sales professional in the golf club industry, for example, would want their company to sell every putter, wedge, iron, hybrid, fairway club and driver that a golfer would want to put in his bag. That's many different part numbers to manage, plus a high volatility in demand, shipping and inventory control. But a sales professional needs to be able to service the customer's lower demand items in order to be strategically positioned to meet the high demand items.

单词：Product cost，Demand Planning