这是一篇AMJ文章，标题是《垂直一体化与合作战略》的摘要部分，请问这段到底在说什么。有没有大神可以地道的翻译一下，或者解释一下？跪谢。
Proposing a new look at vertical integration and Ihe dimensions that comprise it. This study develops a framework for predicting when firms use make-or-buy decisions. The strategic business units (SBUs) studied made fewer products and services in-house and firms were engaged in fewer stages of processing when demand was highly uncertain than they did when demand was more certain. Internal transfers from upstream or to downstream business units were more numerous when synergies with adjacent SBUs were substantial than when they were not. Some competitive imitation of vertical integration strategies occurred, and firms with high market shares sought higher ownership stakes in stages of processing adjacent to those markets.