贝莱德的资金规模远胜过其竞争对手（见附表）。它同时也是资产管理公司中，产品线最为多样的之一。由于采用。
BlackRock now towers above its competitors in size (see table). It also has one of the most diverse product lines of any asset manager, a response to the.
产品线扩展是多产品企业的主要竞争手段之一，也是新实证主义产业组织理论研究的重点内容。
The product line extension is one of important rivalry instruments for the multi-product firms, also a study focus of new empirical industrial organization.
特征模型本质上也是一种需求的组织方式，在以产品线工程为基础的应用系统开发活动中，特征模型为该系统的需求提供了一个复用的框架。
Feature model is a form of organizing requirement essentially, which provide a reusable framework for the requirement of the application system in the development of it based on SPL.
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