在软件生命期尤其是长期的支持和维护过程中(这也是应用程序生命周期中最昂贵的一个阶段)，应用程序和领域模型的重用将提高ROI。
ROI will rise from the reuse of application and domain models across the software lifespan, especially during long-term support and maintenance, the most expensive phase of an application's life.
但事实是，无论你使用什么样的方法，都是一个困难，漫长并且往往昂贵的过程。
But the fact is that no matter what method you use to do so, it's a hard, slow and often expensive process.
他重新设计了他的tadpoles的蛋白质的头，并在早些时候决定那，自己不生产这种蛋白质-一个昂贵和辛勤的过程-他会付钱给一家公司为他达到预定目标。
He has redesigned the protein heads of his tadpoles, and decided early on that instead of producing the protein himself - an expensive and arduous process - he would pay a company to make it for him.
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