product difference的用法和樣例：
例句
- One such uncertainty is the extent of product differentiation that the imitator can achieve.
其中一個這樣的不確定性是模仿者所能夠達到的產品差異化的程度。 - 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.
這篇文章主要的貢獻在於在產品分類中的產品差異化本質是內生於企業模仿進入的決策的。
