双语例句原声例句
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用例3：使用NUMROWS获取更真实的估计和成本。
Case 3: Use NUMROWS to get more realistic estimates and cost.
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很难估计出不同选择的成本和收益。
It's hard to estimate the costs and benefits of making different choices.
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当然，实质上对成本和工作的估计可以应用同样的推理。
Of course, essentially the same reasoning applies to cost and effort estimates.
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And what it involves is placing a value, usually a dollar value, to stand for utility on the costs and the benefits of various proposals.
其做法包括，作出估价，通常是估计出金额，来代表功利,即分别列出成本，和各项收益的金额。
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