产品线：产品线(Product Line) 是指一群相关的产品，这类产品可能功能相似，销售给同一顾客群，经过相同的销售途径，或者在同一价格范围内。 如果能够确定产品线的最佳长度，就能为企业带来最大的利润。

Product Line: Product Line refers to a group of related products, which may have similar functions, be sold to the same customer group, through the same sales channels, or within the same price range. If we can determine the optimal length of the product line, we can bring the maximum profit to the enterprise.

产品组合，通常由若干条产品线组成。产品线，是指同类产品的系列。一条产品线就是一个产品线 

产品类别，是由使用功能相同、能满足同类需求而规格、型号、花色等不同的若干个产品项目组成的。一个产品项目，则是指企业产品目录上开列的每一个产品。

Product portfolio usually consists of several product lines. Product line refers to the series of similar products. A product line is a product line.

Product category is composed of several product items with the same function and different specifications, models and designs to meet the same needs. A product item refers to each product listed in the enterprise product catalogue.

产品组合的宽度，是指产品组合中包含的产品线的多少，包含的产品线越多，就越宽；产品组合的深度，是指每条产品线包含的产品项目的多少，包含的产品项目越多，产品线就越深；产品组合的关联度，是指各类产品线之间在最终用途、生产条件、销售渠道等方面相互关联的程度，不同的产品组合存在着不同的关联程度。

The breadth of product mix refers to the number of product lines contained in product mix, and the more product lines included, the wider the product mix; the depth of product mix refers to the number of product items contained in each product line, and the more product items included, the deeper the product line; the degree of association of product mix refers to the end-use, production conditions, sales channels and other parties among various product lines. There are different correlations among different product combinations.