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。
图片发自简书App
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
https://en.m.wikipedia.org/wiki/Product_life-cycle_theory
Product_life-cycle_theory
主旨：The product cycle is an economic theory explain the observed pattern of international trade. The model applies to labor-saving and capital-using products that (at least at first) cater to high-income groups.In the new product stage, the product is produced and consumed in the US; no export trade occurs. The model demonstrates dynamic comparative advantage.
关键字：product life cycle 生命周期
