Since well-known techniques for estimating costs and calculating ROI already exist, there's no need to invent new ones.

既然已经有了比较出名的评估成本、计算roi的技术，也就没有发明新技术的必要。

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Armed with facts and figures about the existing environment, start estimating the costs to build the new enterprise architecture.

有了关于现有环境的事实和数据，现在可以开始估计构建新的企业架构所需的成本。

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And while a teardown doesn't account for the costs of design, software, manufacturing, or shipping, these cost estimates help fill in the blanks toward estimating the profit on each device sold.

但拆解并没有计入设计，软件，生产和运输的成本。这样的开销估算填补了对每一台售出设备的利润估计的空白。

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But he warned that the industry does not yet know for certain the length of sewers being taken on or what condition they are in, so estimating costs is difficult.

BBC: Water companies told to deal with private sewers

Some say that data-center landlords aren't taking into account increasing technological advances when estimating these costs.

WSJ: Data-Center REITs Lose Favor

Nobody really knows because, save for the leap in petrol prices during the 1970s oil crises, there is little basis for estimating to what extent higher marginal costs reduce driving.

ECONOMIST: A survey of commuting