如果您的项目处于开发阶段，今后更改数据库架构可能会导致巨大的代码更改，从而阻碍可交付结果的及时交付并降低质量，进而增加成本。
If your project is in development, late changes to the database schema could trigger significant code changes that jeopardize the timely delivery and quality of the deliverable, thus increasing cost.
最后，详尽地论述了供应链中的循环库存和安全库存，并讨论了在既不降低供给水平同时又不增加成本的基础上，如何降低循环库存和安全库存。
Finally I study the cycle stocks and the safe stocks of the supply chain in details, and discuss how to reduce them in the preconditions of not lowering the supply level and increasing cost.
一个DC - DC转换器能够纠正这一问题，但这样的规会增加成本，并推出10至百分之十五的效率损失。
A DC-to-DC converter could correct this problem but such a regulator would add costs and introduce a 10 to 15 percent efficiency loss.
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