product difference的用法和样例：
例句
- One such uncertainty is the extent of product differentiation that the imitator can achieve.
其中一个这样的不确定性是模仿者所能够达到的产品差异化的程度。 - The main contribution of the article is in showing that the nature of product differentiation in product categories is endogenous to the imitative entry decisions of firms.
这篇文章主要的贡献在于在产品分类中的产品差异化本质是内生于企业模仿进入的决策的。
